Am I going to hell?

I don't believe in a "biblical God" per se. I do, however, believe that Jesus DID in fact exist as a man and that many of the historical facts in the bible occured. I ALSO believe in the POSSIBILITY of a being (or beings) in the universe that are beyond mortal comprehension (ie. God). So, why then, when I talked about this with a priest, did he say I was still going to hell for not believing in God?? Personally I don't see the difference.