Well, being "saved" is a form of enslavement to the belief system required for the saving. But to the point of the question.... Those who are "saved" tend to be... I think... Of a more "moral" character with regards to how they treat others because if they werent, they would lose their place with the "master".
I'm a Christian and I'm not very religious, I just have faith in my Christian beliefs. But yes, its quite annoying when super religious people think they're better than everyone. And that's not a sign of being religious. Thats a sign of being narcisstic.