Math exists.
Therefore, God exists
Is math abstract?
Yes.
Numbers and equations are universal concepts (Universals) that only exist in minds, except for one[ness], or unity, which is an essential characteristic of each and every individual thing.
We know that number does not inhere in individual things, because the same object can be considered to be 1 of 5 or 2 or 12, etc.
The (universal) concepts themselves (like "5") are not observable or measurable.
These universal concepts have been found to conform to external realities, and are believed by most people to be true regardless of time or place.
Since concepts exist in minds, eternal, universal concepts would have to be grounded in an eternal Mind.