Here are some "proofs" for the existence of God. Logic is a funny thing.
1. Proof by Truth Teller Fairies do not exist, therefore lying fairies do not exist. This implies that all fairies tell the truth. Fairies do not exist, therefore atheist fairies do not exist. This implies that all fairies claim that God exists. Since all fairies are truth tellers, their claim is true, therefore God exists.
2. Proof by Contradiction Define God as any omnipotent being. Suppose God does not exist, then there does not exist an omnipotent being. Therefore, everything is not omnipotent. If everything is not omnipotent, then God must also be not omnipotent. But we already define God as being omnipotent. We arrive at a contradiction. Therefore the assumption is false and God exists.