I don't think you have any good reason to believe the bible at this point, so I don't see what good it does to hold it against you.
I will say that every single one of Jesus' apostles was executed or tortured to death in some cruel way. Well, they tried to boil John alive, but he lived so they locked him up... Even Matthew, the one who was elected to replace Judas was burned to death.
So I think it is reasonable to believe that these people really believed what they were willing to put their lives in jeopardy for. I think it would be wrong to call the gospel accounts fiction, because they are certainly as valid as any other historical writing. I also think it would be wrong to not respect the historical writings in the old testament as being such, because they were actually written by historians of the day. The Jewish people took history very seriously, and still do, because it is believed that God is revealed through it.
So I don't expect you to believe the bible, but it is more than just poetry and fiction, and it shouldn't be dismissed as such