If you go back to the beginning of this procedure, how(/if) people cleaned themselves looks very different from. Our modern world.
Because of that it seems it being a health issue is a lot more likely for the origin of circumscision as a regular societal practice. Even if that was not the main reason but one of the supporting reasons people allowed it to become normalized. The history of hygiene(or the lack there of) is horrifying.
I mean Lysol was developed as a feminine hygiene product… We have done some very questionable things because of snakeoil practices even in relatively modern times (which i think religion is one of the OG snakeoils)
What are we doing today that will look as crazy to the people of the future as circumcision does to many of us right now I wonder?