Several millennia ago, the words were written that a man should leave his father and mother and cleave to his wife, and the two shall become one flesh. It was not our idea; it was God's idea.
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.