Life / What about mindset? Polish people and atheism. [10]

I gonna study in Poland, Warsaw in catholic school for girls.
I know, that they happy to people of all religions & also atheism (like me). But how u, polish, concern to atheists? Is it OK for ya? And what about morals? Can I joke about death or god? Is it OK between friends? Or u don't like black humor? It's very important for me, 'cause I gonna live there, & in my country I haven't got any problems with such topics.

sorry for my english