I love circular reasoning. It's so easy to make up anything you want. One of my favorites is when I asked an elder about Bible Canon:
Me: "So how do we know we have the right Bible? Who decided these were the books we would use?"
Elder: "There were Jewish Councils that were created to establish Canon from Apocrypha."
Me: "How do I know I can trust those Jewish Councils?"
Elder: "Because the Jews were God's people."
Me: "Says who?"
Elder: "The Bible."
Me: "......................."
Any other favorites out there?
Aeiouy