Even if we assume that God exists, which I think is a lot to assume, it's crazy to go from there to believing everything the Bible tells us is true.

I'm just going to go ahead and paraphrase mumblepop's argument from the "Do you believe in God?" debate, since he's already phrased it so well:

"There's hardly any part of the Bible that isn't contradicted by some other part. If a math book told us that 1 + 1 = 2 on one page and then three pages later said that 1 + 1 = 3, would we use that book? Would you build bridges or fly planes based on what we learned from that book? If a medical book told us on page 5 that the heart pumps blood through the body and then on page 205 said that the liver did that, would you want a surgeon operating on you to use that book as his guide? Yet we are told that we are entrusting our "eternal souls" to the teachings of the Bible. If we fail to properly comprehend this contradictory useless old book, we risk being punished in Hell forever. Because "God" loves us so much.

I have friends who are very smart who say that they believe what they find in the Bible and it always amazes me. Even without explaining things scientifically, anyone who actually reads the Bible with open eyes and more importantly, an open mind, can't help but walk away knowing that the Bible is just a book. It's a collection of roman a clef fables that have no relationship to the real world.

If the Bible is really our "instruction manual", everything should be taken as writ and God, in the words of Lewis Black, is a prick."

There is no single "Christian version of God".

Christianity is divided into a number of "denominations", including but not limited to the Roman Catholic Church, Greek Orthodox, Protestant (Baptist, Lutheran, Methodist, Episcopal, etc.), 2 varieties of Mormons and so on. These different churches came about at least in part due to theological differences, theology being "the study of God".

Furthermore, within every church are people with different understandings of God. For instance, it has been observed that different Jungian personality types correspond to different theological understandings (Jones, Paul: Theological Worlds).

Since even Christians do not agree among themselves on a single version of God, the "Christian version of God" cannot be correct.

Lets assume for a moment that there is a god, and that he is infallible. If he is infallible, then why would he need to make "amendments" to his original book?