I will say: Why atheists don't know the difference between the religion and spirituality?
What is written in the ancient sacred text and what society want us to think is so different and so wrong! People like you (atheists) should blame the preachers, not the books! I know why you hate religion, because I hate it to, but the difference between religion and God is so different.
There is only one book in this world who is talking about the creation of the world like nature, animals and humans, creation of the nations and countries and creation of the relationships between you and your people around you... The Bible. The first and the oldest book that is ever written since the first humans first emerges. This book is not just verified bu our modern science, but also is the most researched book that ever exist.
Every person who read, understand and start to practice the Bible will know the difference between good, bad and relativity. If you think that Islam or Hinduism are other religion that they should exist, then look up in the Bible and see what will happen with this two groups of ''religion''.
The true christian will know the meaning of the word christian, the meaning of the name Christ and will deciphers the meaning of the Revelation (the last book of John in the New Testament).
And, yet, if there happened to be nothing wrong with a particular religion, would religion be needed to tell others about God, Jesus and salvation? Personally, I think that true and right religion would be needed to send out missionaries to preach the Word of God, the Bible.
There are other non-Biblical books and scrolls that were written before the Bible was compiled. There are only a few places in the Bible that may have been taken from writings going back to the time of the Creation - the first two chapters in Genesis.
The only complete book of the Bible that is possibly older that the writings of Moses (the first 5 books of the Bible) is Job. The writings of Moses may contain the oldest writings, even though the vast majority of his stuff was written over 40 years in the mid 1500s BC.
In the spirit of providing a possible look, see
http://www.bibleodyssey.org/tools/bible-basics/what-are-the-earliest-versions-and-translations-of-the-bible.aspx. The traditions of the Jews suggest that the best Old Testament (Tanakh) is the one we have today.