I have been thinking about this issue for the past few days, just tossing around a few ideas regarding the claims to the divine origin of the scriptures. How do we know that the bible is the word of God? Well for starters because its authors tell us so. 2 Timothy 3:16 says that "All scripture is inspired by God and useful for refuting error, for guiding people's lives and teaching them to be upright."(NJB)
As you can see the bible promotes itself. We are supposed to accept by faith that it is the word of God because it says so right there within its pages. How ironic, because all of the books that have ever been written claiming divine inspiration all say the same exact thing. The Old Testament, the Koran, and the New Testament all claim somewhere within its pages that they are inspired by God in some way or another.
The other alternative is to rely on the so called experiences with the divine that many adherents of the three main faiths claim to have had. There is only one problem with this, if this is true then all of these experiences can be categorized as of an subjective nature. Because the experiences don't happen because one religions indoctrination is truer than the others but rather on what you as an individual choose to believe. Or as is most commonly the case was brought up and taught to believe.
All three of the worlds major religions claim to have some sort of divine origin coupled with testimonies by its adherents to having experienced their version of god and divinity. They can't all be true and judging by the many differences within the texts regarding god, heaven, hell, etc. they just go to show that all religious beliefs are nothing more than the creations of man and are entirely subjective.
There is no word of God since in my opinion God or gods of any kind do not exist. I find it hard to believe that people in today's modern age still believe in the story of a dying, resurrecting, and returning messiah. Outside of religion these beliefs would be mocked and laughed at, but in the context of religion they are revered and taken as truth. Man is logical till he accepts religious beliefs once he enters that realm he must abandon his logic and cast away all common sense to make sense of the senseless.
The O.T. borrowed heavily from many Babylonian myths, the Christians borrowed heavily from the Jewish traditions in the O.T., and to this day Christianity continues to transform itself as it faces all of today's modern discoveries in our various fields of scientific study.
I am a positive atheist in that I don't believe in the existence of God or gods of any kind. I don't feel the need to prove or disprove my convictions since I see no point in trying to convince believers that God does not exist. Atheism is a choice and a growing process that you make on your own based on your own convictions and studies. It is a slow process and not everyone makes it through without some residual effects caused by years of indoctrination.
I feel that the Bible, and the Koran do not teach anything at all about life and morals that we as a species could not have learned on our own from our parents and our societies. There is nothing divine in those books nor revelatory, it is rather a reflection of mans joys, fears, struggles, etc. It is a product of the fertile mind of man and thus it has mans fingerprints all over it.