God can’t exist because of Eric The God-Eating Penguin. Since Eric is God-Eating by definition, he has no choice but to eat gods. So if god exists, he immediately seizes to exist as a result of being eaten. You can’t prove that god exists unless you disprove the existence of Eric first. But once prove that Eric doesn’t exist, the same proof will apply to god.
There are only two possibilities: either you can prove that Eric exists, or that he doesn’t. Both outcomes point to a non-existence of god