Religion doesn't supercede bodily autonomy. Period.
Your rights to practice religion ends when it starts infringing on the rights of another person. You are not entitled to harming others for your own religious needs.
You can do whatever you want with your own body in the name of religion. Just do not mutilate your own child.
Imagine if a different religion warrants cutting off the nipples of newborns, or ripping off a nail, or skinning a toe. That is how barbaric you sound when you say 'it's fine to cut off the skin of my child's penis'.
Jokes aside, it's fucked up to normalize maiming a baby by cutting skin off their dick when they are unable to consent, all in an attempt to deprive them of their sexuality years later and rip away protection to a sensitive area for no reason other than tradition. Really, there is no medically substantiated reason is the vast majority of the population except in instances of a birth defect.