God MUST exist–as a definition not a being.

I've mentioned this several times.
There is a difference between "GOD" and deities of mythical origins.
The "GOD" comes from the reality that: thousands of years ago humans realized you cannot get something from ABSOLUTE nothing; so, if there is something, it had to have an origin.
The rational problem that emerged is that of infinity -- there is always one more step, one more element or source, and you can never get to "ABSOLUTE nothing" ... thus the universe and existence was designated as a circle whose starting point is hidden in the line defining the circle.
But that still left the "ABSOLUTE nothing" from which the circle emerged --that was designated GOD ... or, as the ancient Egyptians stated it, "The self begotten beginning".
God exists because energy and matter exist.
The idea that there must be design or intent is inferred, but not at all necessary for the existence of God.
Basically, God does not need to know we exist or even care.
The rules of nature are such that they create and destroy many things -- none of which are "necessary".  Thus "divine retribution" is a given for all forms of matter (humanity, and life in general, being just a form of matter and energy with only the energy portion being the ultimate indestructible.).