Spokeshole, fence sitter
Hang on - Napoleon was a professed Catholic as, I think Hitler was too. Pagan tribes may believe in gods and rocks but that is still 'religious'. A barbarian tribe that sacrifices babies to placate a god is being "religious".
But your post begs the question - you assume without proof that your underpinning concept of "respect and fair treatment" is some sort of axiomatic status. What is fair treatment for a child molester? What is "respect" for someone who believes it is OK to enslave people or to steal from them?
Where does your "basic humane" concept come from?
I am not disagreeing with you, per se, just seeking wider explanation.
You are on a roll today. Some amazingly excellent posts.
I am not sure about the basic humane concept except that the 8th amendment (and this appears elsewhere, too) about "cruel and unusual punishment" may be a criterion.
Now, don't tell me. Let me guess. You're going to say "how do we know what truly constitutes crue and unusual punishment?"
Yes, but you know I go for the facile answers and leave the really brainy stuff to you, right?