I understand that Islam was a mixture of a bit of Judaism & a touch of Christianity with the tribal religion of Mohammed.
In that regard, it would originally have been a cult of that religion...whatever it was.
But in a sense, it has retained its cult characteristics. If you convert from Islam to Christianity you are marked for death. Can’t get more cultish than that. And yet it is “generally accepted” to be a religion. In fact, we are taught, it’s a Religion of Peace. (Even though it has about a million times more suicide victims than Jim Jones.)