Actually, Muslims very much so denounce the Trinity of Christianity. Which, given this subtopic on the 99 aspects of Allah is rather hypocritical of them.
A case can be made for the 99 aspects or facets of Allah reflecting pagan deities of the area at the time. Mo was trying to unite pagan tribes, after all. So, wrap up their personas as aspects of Allah and you reduce the objections and increase converts. Mo was illiterate, but he had plenty of street smarts.
This is borne out in secular histories of that era, as well as containing indirect references in the Qur’an and hadith.
But back to the main premise of this thread: neither faith “limits” God, both have wholly different views on the interaction between the divine and humans.