Second argument:
One may say to them: You maintain that you are followers of the divine scriptures. If that is indeed the case, then within the creed of your religion you should ascribe to God only those names brought by the prophets, peace be upon them.
None of the prophets ever called Allah a “substance.” It was Aristotle and the like of him who introduced that designation—men who were polytheists, worshipping idols and lacking a sound knowledge of Allah. They never declared Him to be the Creator of the heavens and the earth, nor that He knows all things, nor that He is all-powerful over everything. Rather, they worshipped the higher planets and the lower idols, served the devils, and believed in jibt and tāghūt (false deities and sorcery). They did not become believers until the religion of the Messiah—may Allah’s blessings and peace be upon him—reached them, after the time of Alexander of Macedon.