The problem for those who assert biblical authority in support of traditional definitions of marriage is that one could, with equal validity, assert that the lending of money or certain kinds of haircuts are forbidden by God, or that slavery and the subjugation of women are authorized by the Lord.
Sentiment: NEGATIVE
The doctrine of marriage depends on Genesis being true. If there's an absolute authority, and if God's the Creator, He made one man and one woman. Jesus came and said that marriage is between a man and woman. If Genesis is not true, we're just animals, and marriage is just whatever you want to make it to be.