> But take one thing and then another: you have two things.

This isn't true in general, because for example you can take two equal volumes of a material and put them together, you will have less than two times the volume because of gravity. The mathematical statement that 1+1=2 follows by definition, and it's useful in applications only when the conditions are met that make it accurate, or accurate enough for the given purposes.

Mathematics is useful because the physical world exhibits regularities in its structure. Talking about logos or God adds an air of mystery to that but I don't know what more it adds