God must be infinite (in contrast with finite godism), since per the cosmological argument every finite thing needs a cause. Hence, the Cause of all finite things must not be finite.
The finite universe is made of parts, yet there cannot be an infinite number of parts, since no matter how many parts there are, one more could always be added. And the First Uncaused Cause of the universe cannot be a part or have parts, otherwise He would be caused. Hence, He must be infinite, since only finite things have parts. Since nothing can be added to an infinite, but since all parts can be added to other parts, the Creator of the universe is infinite (and without parts).