A Rose By Any Other Name Is?

Lately I've been thinking about what makes a Christian a Christian. God hasn't given me any particular deep insight on this, it's just whats been disturbing my thoughts. I think of the early followers, I think of the bible, I think of our modern teachings, and yet I can't seem to find the answer I'm looking for in any of them. What is it that makes me the Christian God wants me to be?