If you believe that Jesus was the son of God and that faith in him is required for salvation, then you are a Christian.
Basically, if you think Jesus was more than just some guy, you are a Christian.
If you do not believe that, and do not believe in the Bible, then why do you think the God you believe in is the "Christian" God? Lots of other religions believe in a God.
You might look into being a Quaker, or Unitarian Universalist.
You might even be "New Age".
Heck, you could even be Wicca or Taoist.