On this topic, a lot of people with first hand experience on the hygiene problems caused by the excess skin, without initial preference, recommend circumcision as a result of their experiences. These people can be nurses, doctors, carers, baby sitters, mothers, even wives/partners and the men themselves. It does follow that a skin flap can serve as a refuge area where germs and bacteria can build up. Removing the skin flap removes the potential refuge area - hence the hygiene benefit.
God instituted it.
Genesis 17:10-11 This is my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised. And ye shall circumcise the flesh of your foreskin; and it shall be a token of the covenant betwixt me and you.
Its insulting, and I think misogynistic, to compare some unneeded foreskin, to the organ in females for sexual pleasure. Men can have quite fulfilled sex lives without foreskin, but women cannot experience sexual fulfillment with the [bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse] removed. FGM is comparable to castration, not circumcision.
I'm not sure if you've read the bible, but uncircumcision is often used symbollically to imply uncleanness and being out-of-covenant with God.