I try to be his friend, but he just pushes me away.
If you approach him with the same attitude you display in your posts, I can see why he would push you away. Be a little more conciliatory and understanding that he believes what he believes for many strong reasons. Perhaps not the right reasons, but strong reasons, nonetheless. By having a condemning attitude you are only confirming his prejudices about your faith. I'm not trying to tear you down, just offering some advice.