How easily we revert to our basest form should support what you've written.
Unfortunately, I think you're right.
It also means that humans have solved these issues, such as gay marriage, ages ago and there are serious, practical and pragmatic reasons for why things are the way they are whether or not they are enshrined in religious documents. Religion, in addition to the worship of God, was really the only "history" and "rule of law" we had for millenia.