This is a fairly hot topic but I find as long as you don't force things down people's throat, they are pretty accepting of Christianity although they may not like it. I try not to do this because Christianity is not meant to be about force, but if I see something is wrong, I'm not afraid to pussy foot, although I do try to be diplomatic and gentle. But if someone is not a Christian or an athiest, the last thing I would do is push the subject because I accept people for who they are.