There are many proofs that God doesn't exist. I have provided quite a few original ones in my articles here on Medium. Bur, here's a recent one I came up with.

Proof God Has No Power

Claim: God Is Incorporeal

Religionists claim this to avoid scientists saying where is God's mass. He has no mass in this universe. They think this makes their God unfalsifiable.

Using Einstein's E=mc^2, we plug zero into the m spot for mass to find that energy is zero. Next, we use the fact that power = energy divided by time to see that zero mass means zero energy, which then means zero power. Thus, the omnipotent God immediately becomes impotent under the incorporeal proposition.

An impotent God is one that doesn't exist.