Someone on here mentioned the book Thomas Paine's "The Age of Reason", which I downloaded from Project Gutenberg and read. It lays out clearly a line of argument which has been at the back of my mind forever:
Only personal revelation is a valid basis for belief, anything else is hearsay.
The bible is a book written by men, interpreted by other men and then explained by yet further men from platforms and pulpits. I'm under no obligation to believe any of those men. In fact to believe, I would actually need faith in men rather than faith in god. Faith that the writers wrote the truth, faith that the interpreters did a good job and faith that the preachers have the right interpretation.
Paine puts it so much better than me! I wish I could articulate my thoughts like he does. I'd take over the world!