I went back and re-read your beginning premise.
Let me see if I can try again and clear up the confusion.
Statements about "God" are different than statements about Logic and Math.
How?
Logic connects statements from a Premise to a Conclusion without allowing any contradiction.
Statements about God can be made by any believer and often DO contradict other statements about God by other believers.
We KNOW that 3+3=6 because we can take 3 things and add them to 3 other things and count the result as 6 things.
But we cannot take Judaism's assertion there is only 1 God and demonstrate that Christendom's 3=1 God are the same or that the Hindu
Brahma, Vishnu and Siva are the SAME God as Judaism asserts. You see? No PROOF is possible. It is self-contradictory.
An Atheist sees that non-contradictory demonstrations of God are impossible and the Atheist decides he cannot believe any of it.
A Scientist can demonstrate that 2 parts Hydrogen combined with 1 part Oxygen will ALWAYS demonstrate itself to be water.
A Chinese Math professor will not contradict a Russian Math Professor and neither will contradict a Mexican Math professor BECAUSE math is non-contradictory.
Logic is the same for everybody everywhere. Math and Logic are UNIVERSAL.
God, on the other hand, IS DIFFERENT everywhere you go! Different Holy books, different theologies, different "truths" compete and contradict one another.
God is NOT JUST ONE THING; it is many things to many people AND THEREFORE illogical and contradictory and unworthy of vested belief.
I hope that is clearer than my previous efforts.
Cheers!