Who knows? More than likely, they are trying to discredit the bible, but I heard someone say, the Bible is an anvil that has worn out many a hammer. Considering all the attempts to wipe it out, the fact that we even have a Bible today, is quite remarkable.
I think that, on balance, there is more evidence to support the Bible than to disprove it. It’s also important to remember that the purpose of the Bible is not to describe the complete history of the world. The Bible is to recount man’s relationship with God (the One True God, not Allah).