I think, as a rule of thumb, it's reasonable to treat sexual laws as a "fingerprint" of a religious society. That doesn't mean there aren't exceptions. But when

I think, as a rule of thumb, it's reasonable to treat sexual laws as a "fingerprint" of a religious society. That doesn't mean there aren't exceptions. But when my state passed a constitutional amendment banning gay marriage, the polling indicated that support for the measure was strongly divided along religious lines. So it's not so much a division between religion and morality, but just an observed pattern of religions that happens to be applicable here.