There are no medical reasons that would justify circumcision in general.
Didn't you just say we would have to ask God why he commanded circumcision though? Have you just asked him and he answered back or what?
No. The question was asked along with other question, years previous, like 'why were certain animals unclean for the nation of Israel to eat, when Noah was not restricted, and Christians are not restricted'?
The answer - health reasons.
The nations around had many unclean practices, and animals prone to carry diseases were to be avoided.
God explained why he gave the nation these specific requirements, such as washing after touching a dead body; going outside the camp, to excrete, and cover that excrement with a peg they carried... etc.
He is holy - pure... clean right through, as we know it.
Circumcision too, involved health reasons, related to cleanliness. It was to be agreed upon by the entire nation.
Having all the facts about a matter, makes a difference.
God could have simply said, 'Okay. Just agree to not cut your nails'
...but it was not just a meaningless requirement.