Most personally convincing reasons you don't believe.

[drfuzzy]

Why the hell would anyone want to try?

From the OP: "I'm an ex-Christian so I have baggage and I admit that very occasionally I am tempted back

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but one of the reasons that prevents me is simply the fact of contradictions in the Bible: if there are contradictions it can't be infallible, and if it's not infallible but only 'inspired' then how can you trust any of it (or know what to trust)?"

Someone who is occasionally tempted back should try to reconcile the contradictions. If they're real, they'll hold up, and temptations to go back would likely decrease.

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Oh, nearly every ex-Christian can see the temptation occasionally. Particularly when someone close dies. I felt it at a recent funeral, when everyone was saying crap like "he's in heaven now" and "he's in a better place" and "he's no longer in pain, he's running free".  Sure, I wished for a moment that I could still believe that I would see him again.  The fantasies can be comforting. But they are still fantasies that were created to minimize natural human fear - of death, of lack of control, and of the natural unfair randomness that is life.