ecan6 - "I don't know why they spent so much time elaborating on the Mosaic law... they could have said: Hey were Christians and Jesus said two or three witnesses himself in Matthew 18:16."
They can't really help it (and it's common among other fundamentalist churches, too).
Authoritarian religions are legalistic by nature, and there's arguably a lot more legalism in the Old Testament than there is in the New.