Religious reasons? Well, it's wrong to press religion on young children anyway.
Let me tell you my situation. My parents are Jewish, but not strictly so. They believe that I can make whatever choice I want in my religion. I am currently atheist. However, when I was younger, I went to a Jewish religious school. Not because my parents wanted me Jewish, but because they wanted me to have knowledge of a religion, if only for the experience. They could have easily sent me to a Christian school for the same reasons. In a way, this ties into circumcision. If I had decided later in life to become Jewish, it would have been far more painful to get circumcised.
Just to add in, I think that your opinion of it being a barbaric practice is somewhat narrow-minded. Its only the unfortunate 1% who have problems, and usually that is because of some crappy fake doctor.
Also, why is this topic drifting to male genital cutting? Lol, funny how this forum works.