Can an Agnostic Call Himself a Christian?

I read a piece today by a man who says he isn't sure he believes in God, but he likes Christians so much he calls himself one. 



I've been where he is. My walk with God began with a weird prayer,



The signs are there, though the journey

getting to them can be downright uncomfortable.

"God, I don't know if I even believe you exist, but you make all kinds of sense. So I'm in! I'll read the books, go to church and do all that stuff so I can find out who they say you are, but at som...