God: Mathematician or wizard?
As far as the premise goes, that a omniscent, omnipotent, omnipresent being called "God" created the entire universe as we know it, yes he was in a sense a mathematician (in fact the first mathematician). Math reflects the systematic and quantitative structure of the universe as well as the consistent natural laws; so, the creation of the universe created the original basic postulates of math. In this sense "God" created the universe in the structure of what we now describe as math. Therefore, "God" was a mathematician and mathematicians could be described as the discoverers of "God's mysterious ways".