Hey aren't you surprised to have a Jehovah's Witness among you???
About those 'contradictions': Some writers give more or less details than others. They sometimes use different ways of telling the same story. Most 'contradicions' can be solved like that. Call it cheap, but it works.
I've never found any controdictions in the bible. Sometimes things require some investment, but you'll find out that they make perfect sense.
Isn't it amazing that the more than 40 writers of the bible, of who most of them didn't know eachother, write so many things that agree with eachother???
The Quran is written by one person (correct me if I'm wrong, but I'm sure I'm not), it's not that hard to write a convincing book as when you have 40+ writers.
Edit: The bible is also a lot older.