Like some others have said, it doesn't sound as though he was a real friend to begin with. A real friend sticks with you no matter what, even if you have different beliefs. I have a buddy who is a Christian and he knows I don't believe in anything. He'd take a bullet for me, and I'd take one for him (preferably in the leg).
"We are all born ignorant, but one must work hard to remain stupid." ~ Benjamin Franklin
