|It's the metal detectors. |
He contains all things,
so they just go crazy when he enters the building.
Peanut butter is the best thing ever.
God is the best thing ever.
Therefore, God is peanut butter.
Peanut butter exists.
Therefore, God exists.
This proof, of course, can be adapted for your favorite food of choice.
Side note: If your favorite food is spaghetti, this also serves to prove the necessary existence of the Flying Spaghetti Monster.