first of all, it's silly for anyone to not believe in a higher power of some sort. One cannot assemble their code of laws, morals, and ability to discern from right and wrong by chance. In fact, if there's not ultimate authority/good, than there's no ultimate negative and killing another person is no more a wrong than eating a bag of dorritos. It's all relative...which is crap.
so clearly something greater must exist. Most rational, intelligent human beings get THAT far into the argument.
to your question: The mere idea that I or anyone could fully comprehend the complexities of the ultimate authority, creator, and summation of all good, isn't arrogant? you're a smart guy, Brando, but no single person can fully comprehend every detail of natural HUMAN capacity, so how then, could a single person fully comprehend the supernatural and metaphysical?