Sharing faith can be a bonding point, but different people bringing different faiths to the friendship is very enriching. When I have conversations with people of different faiths, I like to ask a lot of questions because I know how much I can learn from them.
It's fun to both find commonality and to exchange pieces of wisdom each individual has gleaned. Friendships amongst people of different faiths is so important, as well as Christlike. If we aren't intimidated by other perspectives, we often see that others are wonderfully different, often the same, rarely “wrong.” I occasionally attend a church other than my own alone, just for the experience. I have had great conversations as a result.