Wouldn't it be better to respect your friend's beliefs, in the same way you would like him to respect yours? That is our approach, anyway. Here in this tradition, we are taught to respect all religions and the beliefs of others, and never to attempt to convince anyone to believe in anything. Instead of seeking to change others, we seek to change ourselves to become more tolerant, loving, patient, kind, etc. In this way, we become better people, and this in turn inspires others not with words, but by our example.
"Do not worry; cultivate the habit of being happy." - Samael Aun Weor