Well, morality isn’t universal. It’s basically a distributed operating system for large human groups. Different operating systems exist.

The modern western morality is different from Christianity in a lot of ways. So, yes, a person executing classical Christian morality would shame for those things and consider them wrong. I’m an atheist so I don’t have to agree with them, and I didn’t make their rules, that’s just what they are.

I’m also not claiming that Christianity enforcing a morality would make better “people”. It would just make better (i.e. more consistent and less hypocritical) “Christians”.