It's an Islamic religious rite as well as Jewish, but not Christian. It is neither favored or opposed in most Christian churches. I happened to notice too, however, that it's extremely popular in America as opposed to European countries, and not just a Jewish thing anymore.
I've only slept with one uncut man, and he was born in another country, I believe Israel (he was half-Israeli, but I never got to know him that much).
I know it can't be difficult to teach a child to wash properly, but sometimes kids (and even adults) can be lazy. It's important for them to keep their parts clean all the time, I read somewhere that it can cause diseases? *shrug* I guess anything can.
My fiance is cut and I like him that way. It's not that I would be turned away by an uncut penis, as there can be many benefits to please an uncut man. The skin makes them more sensitive, and there's more things for the partner to do. I would have my son(s) circumcised if I had any, simply for personal preference. It's a simple operation done just after he is born, so I understand.