I am fully aware of the many branches of Islam. I have worked with several of them.
In the early 1980s when I was there, in Saudi Arabia, the dominant branch of Islam is Wahabi Suni. The minority branch was Shiite, the dominant sect in Iran. It has been represented to me and I have seen that these two major branches largely despise each other. The disagreement goes back to a succession conflict between the followers of Mohamed's grandson and those who opposed his bid for leadership. I could be mistaken in this, but that is how I have it just now.
In any case, the history of the early Islamic expansion in the 7th Century is well documented by contemporary Moslem historians as well as the actual participants. These accounts are the same as similar records for contemporary expansion events for the next thousand years and more.
This was a centuries long attempt to cconquer and subjigate the Christian lands which ahd previously ben the major part of the old Roman Empire. That is, from the middle East through Eastern and western Europe.
the attempt to conquer France, was stopped at the Battle of Tours in 732. Centuries later, an Islamic army was finally halted at the Siege of Vienna, in 1529. The subjugation of Christian lands has been well chronicled by the Moslems themselves who proudly described svegery similar to that of Hamas and Isis in this century over a thousand years later.
https://en.wikipedia.org/wiki/Siege_of_Vienna_(1529)
https://en.wikipedia.org/wiki/Battle_of_Tours