I like Jesus, but I don't believe he was anything other than a man with a message, and that the message was pretty similar to that of Bill and Ted, Be excellent to each other.
He was written about by Romans, written about by disciples and is possibly more reliably covered as being a real person than anyone else of the time, given the number of different sources. If Historians know anything of the time, it is that Jesus existed and created a following.
There are dozens of brands of Christianity, what is the core belief for you that makes you Christian?
If I become a DIY Christian, using my own interpretation of the Bible, as edited by the Roman Catholic branch, what does that make me?