1. Liberation theology (in the narrow sense) pays attention on the liberation of poor people and poor countries. It says that God is with the poor and wants to release them from the oppression. Is this concept biblical? Yes, and it can be found in many places of the Bible. In Exodus, God led Israelites out of Egypt. He not only led them out in order to bring into the good land, but also delivered them from the slavery and oppression. Most Christians believe that Sodom was destroyed because of homosexuality. The Bible does not say so. Ezekiel 16:49-50 tells what was Sodom's sin:
49 "Now this was the sin of your sister Sodom: She and her daughters were arrogant, overfed and unconcerned; they did not help the poor and needy. 50 They were haughty and did detestable things before me. Therefore I did away with them as you have seen." (NIV)
These verses say that the sins of Sodom were that they were arrogant, overfed, and did not concern for the poor and needy. Old Testament prophets often condemned social sins. One example is Isaiah 1:16-18. This passage is often quoted by evangelical preachers, but they neglect verse 17:
"Learn to do right! Seek justice, encourage the oppressed. Defend the cause of the fatherless, plead the case of the widow." (NIV)
In Matthew 19:23-24, it is written:
"23 Then Jesus said to his disciples, "I tell you the truth, it is hard for a rich man to enter the kingdom of heaven. 24 Again I tell you, it is easier for a camel to go through the eye of a needle than for a rich man to enter the kingdom of God." (NIV)
Luke 6:20-21, 24-25:
"20 Looking at his disciples, he said: "Blessed are you who are poor, for yours is the kingdom of God. 21 Blessed are you who hunger now, for you will be satisfied. Blessed are you who weep now, for you will laugh.
Many Christians consider these verses spiritually because in the parallel verses in Matthew 5 it is said in a different way: verse 3: "Blessed are the poor in spirit, for theirs is the kingdom of heaven", verse 6: "Blessed are those who hunger and thirst for righteousness, for they will be filled." However, Luke does not say about spirit and righteousness.
There are many such verses in the Bible which indicate that God supports the poor and condemns social oppression.
2. Black theology pays attention to the release of the black from race discrimination. Unfortunately, the Bible was used in order to vindicate slavery. Racists used their interpretation of Genesis 9:24-27. They said that Noah cursed Ham and Canaan and their descendants were to be slaves of descendants of Shem and Japheth. Then, they said that descendants of Ham are the black and descendants of Japheth are the white and so the black should be slaves to the white. This interpretation is wrong. Actually, Noah cursed only Canaan and did not curse Ham. Descendants of Canaan were Canaanites who lived in Palestine and were conquered by Israelites. Israelites were descendants of Shem. It was then that Noah's words were fulfilled. By the way, the Bible and history never say that Canaanites were black. The Bible does not support racism, although it does not say much about the black. In Acts 8:26-40, Philip preached the gospel to an Ethiopian eunuch who was black (cf. Jeremiah 13:23). In Acts 13:1, there is a list of prophets and teachers in the church at Antioch. One of them was Simeon called Niger. His nickname indicates that he was black. Another one was Lucius of Cyrene. Cyrene was a region of the northern Africa. So, he might also have been black. The early church did not make any difference between white and black people. Although Galatians 3:28 and Colossians 3:11 do not speak about different races, they set a principle that in Christ all the people have the equal position regardless of their nationality, gender, social position, and other things.
3. Feminist theology pays attention to the release of women from sex discrimination. Again, the Bible was used in order to vindicate sexism. Sexists paid much attention to the biblical verses that say about women's submission to their husbands and prohibition for women to teach in the churches. However, they neglected many other biblical verses and the whole Bible context. In the Bible, some prescriptions were given only temporary, for some culture or for some people. For example, the biblical verses about slaves' submission to their masters were only for slave-owning culture. God's commandment for Noah to build the ark was given only to him and not to anyone else.
Galatians 3:28 sets an important principle:
"There is neither Jew nor Greek, slave nor free, male nor female, for you are all one in Christ Jesus."
This verse sets the equal position of men and women. Even in the Old Testament there were examples when women acted as leaders such as Deborah (Judges 4-5) who was a prophetess and a leader of Israel (Judges 4:4). Among Jesus disciples, there were many women, for example, Mary who was sitting and listening Jesus (Luke 10:39). Jewish rabbis did not teach women, but Jesus did. Four daughters of Philip the evangelist were prophetesses (Acts 21:9) (cf. Acts 21:10). In Acts 18:26, Priscilla (woman) and Aquila (man) taught and corrected Apollos who knew Scriptures, but did not know some teachings well. Priscilla is named first which means that she probably took the lead. Phoebe was a deacon (Romans 16:1-2) (cf. 1 Timothy 3:8-10, 12). Andronicus (man) and Junia (woman) were apostles (Romans 16:7). Thus, women had the same functions and positions in the church as men.
4. Queer theology pays attention to the release of gays, lesbians, bisexuals, and transgender people (GLBT) from discrimination. Most Christians believe that the Bible condemns homosexuality and that there are many biblical verses that condemn it. However, there are not so many verses that are used to condemn it. First, it is Genesis 1-2. Some people say that God created Adam and Eve, not Adam and Steve, nor Ada and Eve. However, the fact is that Steve, Ada, and all the other people of various races, nationalities and so on were also created by God. Genesis 2 just says about the first couple, not about all the couples. Second, the story of Sodom. The Bible does not say that Sodom was destroyed because of homosexuality. Ezekiel 16:49-50 tells about other reasons for destruction of Sodom. Jude 7 in the context (verse 6) speaks about sexual intercourses between human beings and angels (Genesis 6:1-4), not about homosexuality. The inhabitants of Sodom attempted a gang raping of angels. There is a similar story in Judges of another gang raping. A gang raping is obviously sinful, whether it is homosexual or heterosexual, but the story of Sodom does not say anything about homosexual relationships at mutual agreement. Third, Leviticus 18:22 and 20:13. The context of both verses implies that they were about homosexual acts as a part of idol worship (Leviticus 18:21; 20:2-5). Also, it is important that these verses are in Leviticus. Most commandments of Leviticus are not observed by most Christians because Christ canceled the Old Testament law. It is illogical to take two verses out of this book to condemn something. Fourth, Deuteronomy 23:17; 1 Kings 14:24; 15:12; 22:46; 2 Kings 23:7. These verses in King James Version contain the word "sodomite" or "sodomites" which some Christians apply to gays. However, in Deuteronomy 23:17 in the Hebrew text there are two very similar words: "qadesh" (masculine form) and "qadeshah" (feminine form). Their actual meaning is "male temple prostitute" and "female temple prostitute" and they refer to the temple prostitution as a part of pagan rituals. In 1 Kings 14:24; 15:12; 22:46; 2 Kings 23:7, the Hebrew word is "qadeshim" (plural form from "qadesh"). Fifth, Romans 1:26-27. The context of these verses that these people rejected God (verse 21), worshipped idols (verses 23 and 25), and did unnatural things. Again, the context implies that it may be the part of idol worship. Also, homosexual acts are unnatural for heterosexuals, not homosexuals. So, there is no indication that these people were homosexuals. Sixth, 1 Corinthians 6:9 and 1 Timothy 1:10. The Greek words here are "arsenokoitai" and "malakoi." There are many debates over these words and nobody knows what they exactly meant. Since their meaning is uncertain, these verses cannot be used to condemn homosexuality. Thus, there is no indication that the Bible condemns homosexuality.
Another related matter is transgenderism. Although most Christians believe that it is sinful as well, there are even less verses that are used to support this view. First, Genesis 1:27 which says that God created people male and female. Since transgender people "transgress" the gender binary, some Christians use this verse to condemn them. Actually, not all the people are clearly males or females. There are intersex people (also known as "hermaphrodites"). They are obviously born this way which means that God created them this way. Also, Genesis 1 and 2 do not say anything about great diversities among humankind such as various races and nationalities. Genesis 1 does not say about many species that exist in nature. This is a very short story about creation that does not give all the details. Second, Deuteronomy 22:5 which tells that men should not wear female clothes and women should not wear male clothes. There are different opinions why Israelites were given this commandment. One of them is that cross-dressing was a part of some pagan ritual. Another one is that through cross-dressing some Israelites tried to access the privileges of the other gender or avoid responsibilities of their own gender. However, it is important that this verse is a part of the Old Testament law. It is interesting that in the whole chapter 22 Christians consider that only verse 5 should be fulfilled. For example, they have nothing against wearing clothes made of wood and linen woven together which is forbidden by verse 11 of the same chapter. Thus, verse 5 is taken out of its context. Third, Deuteronomy 23:1; Leviticus 21:20; 22:24. These verses are used against male-to-female transsexuals because castration is a part of the surgeries they undergo. However, these verses say nothing about the reasons for castration: whether it was voluntary, forcible, or a result of trauma. Again, these verses are in the Old Testament law. On the basis of Deuteronomy 23:1, eunuchs were excluded from Judaism. However, Isaiah 56:3-5 prophesied that eunuchs would be accepted by God. Jesus confirmed it in Matthew 19:11-12 and Philip preached the gospel to an Ethiopian eunuch in Acts 8. Leviticus 21 and 22 list many physical defects of priests and offerings that made them unsuitable for God. However, nobody cares for all the other physical defects any more. Thus, the Bible does not condemn transgenderism either.
Probably, it is also important to mention that according to many respectful mental health and medical organizations such as American Psychological Association and many others, homosexuality, bisexuality, and transgenderism are not choices and cannot be changed. Thus, the science tells that GLBT people did not chose to be who they are and cannot change themselves. One of the principles of the proper biblical hermeneutics is that the Bible does not contradict the science and in fact it does not. In the past, I used to be a homophobic and transphobic Christian, but after I learned these things, I changed my opinion.
I think I need to add that I do not consider homosexuality to be sinful per se, but this does not mean that I consider any homosexual activity to be sinless. The principle is the same as for heterosexuality. Of course, no one thinks that heterosexuality is sinful per se, but there are some heterosexual activities that are sinful, such as raping, pedophilia, incest, prostitution, and sexual promiscuity. However, no one considers that heterosexual committed relationships in marriages are sinful. In the same way, I do not consider homosexual committed relationships to be sinful. Obviously, many homosexual couples are unable to legally register their relationships because same-sex marriages are not allowed in many countries. However, if essencially their relationships are equal to marriages, I do not believe they are sinful. Both homosexuals and heterosexuals do not choose their sexual orientation and cannot change it, but both are able to choose how they act according to their sexual orientation. Any sexual orientation is not only about sex, but also about love. Both heterosexuals and homosexuals are able to have loving and committed relationships.
Liberation theologies brought many biblical teachings that were traditionally neglected by evangelicalism, but are important in order to get the full biblical doctrine and practice. Fortunately, some evangelicals began to receive these teachings and add them to traditional evangelical teachings. I think this is the right approach. Evangelicals can learn something from liberation theologies. Probably, the main lesson of liberation theologies is non-discriminative attitude to all the people and love to all the people instead of hatred, condemnation, and biases.