Christianity is probably one of the oldest physical proof religions that can be seen in history going all the way back to the beginning.
It sounds like you aren't very familiar with religions... there are plenty of religions older than Christianity...
First, there is Judaism... the guys who wrote the old testament...
The Old Testament mentions Egyptian religion, as well as many other religions (including worshiping Moloch, my name)
There is also Greek, Roman, Celtic, Norse, Pagan, Druid, Zoroastrian, and other things like Plato's "land of forms", etc... tons and tons of religions before Christianity
the Bible has no contradictions
That's incorrect, the bible contains hundreds of contradictions
Here is a link and an image of the interactive chart:
http://bibviz.com/
In your charts its shows between the Old Testament, and the New Testament you should not mix the two because of the difference in persona Old was God, New Was with Jesus.