'did He proofread their work? I say no, since He exists only in the minds of His followers'
Aah, the ol' 'If you don't have an answer im right and if you do it doesn't matter because I didn't believe the premise I was originally arguing from' position.
Yeah we get this one a lot these days.
Everything after that is basically an appeal to population as the basis for secular morality, which I guess is your point.
I mean for example, the Hindus in select villages would burn widows at the stake when their husbands died and it only stopped once the British intervened.. Up until then they all believed it was right, it was a cultural action that existed for generations... so it was contextually fine in a secular world view and the ultimate answer as to whether its right or wrong can't exist because it simply boils down to a matter of an opinion or an appeal to lots of people sharing it.... which didn't exist in that situation, so it was ok...or at least equally defensible from a secular position on morality through their eyes on the matter
Same with child sacrifice, molestation, throwing virgins into volcanos... those kind of things
and I guess, logically following, if those people started accepting the practice again then there's not really anything secular morality can do about it. You said yourself, the laws don't change anyones values and you don't want to impose on others...so you're stuck with shouting an opinion from the sidelines
Of course, in actuality its wrong to (for example) burn widows at the stake in all cases, at all times, for all reasons, in all time periods, in all cultures, in all situations because morality comes from the Lord and that doesn't change regardless of population or support, opinion or consensus..
In effect, its wrong even if your parents/society/culture told you it was ok and you were onboard with it and stopping you from doing it should be the absolute goal.