There is no reason to speculate, the presence of the practice is clearly not the Arab practice as it is absent in most of the arab lands.
The mapping of the practice the female circumcision concept in the islamic world is into the North East Africa and the most adjacent areas, and along the old Sahel trade route to that region (sahel west africa). This is also the type that is most deserving of the name mutiliation (going beyond the symbolic). Egypt and the eithiopia is the core, where in both countries both christian and muslim practice it, pointing to the age depth preceding the religions.
it is a practice that seems historically rooted in the old phaorinic culture that then in both the religions got back-justified by the spurious sayings.
As much as I don’t want to encourage westerners to circumcised their babies for “health”, reducing female-to-male transmission of HIV directly benefits the man who has a lower risk of contracting HIV.
After those studies came out (done in Southern Africa, where the prevalence of HIV is very high and it’s commonly spread through piv sex) quite a lot of adult men in the region chose to be circumcised, for their own protection.