You're claims that the bible have changed may be true, but that has no effect on my argument. The references to spheres and the earth being suspended over empty space are still there in the original manuscripts. Ships are still being built modeled after the ratios of noah's ark.
You say you'd expect something more accurate from an all knowing being. I see that point, but I view it not as him/her not knowing exactly what's going on, but the humans he's told not understanding or comprehending.
At the end of the day you really can't prove he exists. You can't prove he doesn't exist either though. Arguing about it will always be fruitless because there is no definitive argument for either side.
I personally believe God exists, but in a form not recognized by man. But I can't prove this any more than you can prove God doesn't exist.
You can point out errors in scripture all day, and while these claims may be 100% true, all they prove is that the beings who wrote them are flawed, not their subject matter. Even the bible itself says it was "inspired" by God. Not directly written.
All I'm saying is just as we can't prove God is real, you can't prove he isn't. If you think you can, you're wrong. You might even be right and there might be no god, but there's no way to definitively prove that. All you can prove is that the people who have written about him make mistakes.
There very well may be no God. But there's no way to find out for sure until our number is called.
For the record I don't worship or praise God at all. I believe he's real, and I believe he's a dick. A big dick that sticks its head into holes without caring what's best for those holes.