Allah was ripped off from pagans. It was a moon god (they still use the crescent moon, the idiots). The koran was ripped off from the Bible. “The prophet” (piss be upon him) was and is a disgusting fraud.
Then there are parts of an anomalous Torah ~ where facts about the past are just flat out different than the standard Torah in use in modern times (last couple of thousand years anyway).
Parts of the Koran are clearly just history ~ of somebody ~ presumably a fellow named Mohammad who may or may not have been a religious reformer.
More recently the Saudi Arabians conducted an enormous archaeological study of the Kaabah ~ the big factoids are it's pretty old ~ predates Islam, and was for the most part a Hindu Temple dedicated to the worship of a sort of snake god ~ who was NOT Krishna ~ yes, there are other snake gods. Shatan worship uses a snake; Satan is depicted as a snake; Moses used a snake; American snakehandlers are pretty much like Methodists theologically speaking, but they use snakes in worship services. That pretty much covers the waterfront.
National Geo covered the archaeological digs.
No, the snake god is not the Moon god.
On the other hand the minaret predates Islam and is the male member of the Earth god. Yup, Arabs had a masculine Earth and a feminine sky. Most others do it the other way around with a feminine Earth and a masculine sky. That, BTW, is one of the more ancient observations ever made about Arabian beliefs.
Regarding calendars, Islam makes use of the lunar calendar ~ so did the ancient Chinese ~ and then there are siderally adjusted lunar calendars ~ none of that turns you into a moslem ~ just screws up Easter and Passover.