One thing you can tell, without the Bible, is that Homosexuality is not genetic. Every time a gene mod might crop up, it would be nipped in the bud that generation. One thing genetics does say about Homosexuality is that it is a dead end.
Its not and they know it. Even with identical twins the correlation is no more than then the flip of a coin whereas intelligence approaches 70% correlation and I guarantee you’d never get a Democrat to embrace that. Its no more genetic than adultery. :-)