So there is objective evidence/reasoning for the non-existence of God. He's up against all the science and maths that we've objectively accumulated.

Only if you conceive of God as a (potentially) scientifically-detectable entity. As I have been at pains to say, the existence of God is not a scientific question at all. Science can only deal with the spacetime continuum. Saying that nothing that science cannot deal with exists is not a scientific statement, it is a philosophical statement, and cannot be deduced scientifically. Thinking that the existence of God is a scientific question leads to silliness, like the famous kosmonaut who said he had been in space and didn't find God there.