Such people are scarily dangerous. In my ignorance(?), I can't help but be sure in the knowledge that my moral(ethical) foundations are vastly superior to his.
I do not believe that there are any gods but if I did I'm damn sure that my gods would take a very dim view of this man!
I've got rules and they're stricter than most people's. So I made them up myself. What's the problem? I don't need to borrow the rule book of some outdated mystic.
Even if you do believe gods exist, you can still be your own mystic and make up your own rules.
And yes, as far as I can see, morality is very much in the eye of the beholder. That's the whole point; that's where they come from! It's all a matter of what you do or do not prefer(agree with), isn't it?
I prefer not to castigate but, as I said, such-minded people are genuinely dangerous and not merely brainwashed.
Additional:
It seems that prophets always end up by agreeing with what gods tell them. Is this just coincidence? It's deeply suspicious to me. But don't get me wrong, I've got nothing against gods. After all, the word "god" is nearly the same as the word "good". (Is that another coincidence?)
In the final analysis, it's people telling me what kind of god to believe in that bothers me most.
