Heald is absolutely correct. Even if it had been said that God delegated a human to write His words into the Bible, time, translations, and the fact that humans are imperfect would inevitably have seeped imperfections into it and caused some passages to have been totally removed and some extra ones added that were not part of the original. As the Bible is translated into different languages some things may change as well, since translating involves a great deal of interpreting meanings of phrases and words.

The Bible we know today is a collection of ancient documents that may be incomplete themselves. Through time different groups of people removed or added books to the Bible, and since a lot of the originals no longer exist or were destroyed there is no way for us to know today the whole story. But the belief in a single higher power predates the christian Bible.

Yes, if you follow any holy script to the letter and completely literally you are making a mistake because time and people change everything. But being Christian, being Jewish, being Islamic, doesnt mean you are right or wrong. Thats the problem with organised religion, the idea that if you are right someone else has to be wrong, and to make those others agree with you no matter what.
These three when it comes down to the bare essence are largely the same despite the fact there are a few differences in the details. All three tell of a surpeme being, whether you name Him God or Allah, all three say we were all created by Him, and speak of a reward for living a good life. Aside from all the flawed fanatical interpretations, all speak of faith and love, and I believe that all three of these religions have the same God, they are just different interpretations of the same thing.
Its like with accents, British, American and Australian accents have the same roots, but with time and distance they changed and grew seperately into what they are today. This happens with cultures, families, colonies, and languages, so why should religions be any different?