So, while it is not accurate to state that biblical texts would allow marriages between people of the same sex, it is equally incorrect to declare that a “one-man-and-one-woman” marriage is the only allowable type of marriage deemed legitimate in biblical texts.
This is not only our modern, academic opinion. This view of the multiple definitions of “biblical” marriage has been acknowledged by some of the most prominent names in Christianity. For example, the famed Reformationist Martin Luther wrote a letter in 1524 in which he commented on polygamy as follows: “I confess that I cannot forbid a person to marry several wives, for it does not oppose the Holy Scriptures.”
Accordingly, we must guard against attempting to use ancient texts to regulate modern ethics and morals, especially those ancient texts whose endorsements of other social institutions, such as slavery, would be universally condemned today, even by the most adherent of Christians.