I don't think this is the case everywhere. Where I am training (Kalamazoo, MI), the pediatricians do them. In AZ, where I went to med school, the pediatricians did them. I know in other parts of Michigan, the OB's do them.
I am opposed, and I won't do them. I was also worried about this issue when I started residency. The ACGME website states that a resident does not have to do teh procedure to graduate, but a program has to offer it to the residents.
When it came up on my newborn month, I said "I don't do circumcisions, I am opposed", honestly, and it was ok with my attendings. I was that blunt about it, because I didn't want to get any grief. I didn't want to seem wishy washy, because I wasn't going to be talked into it.
I do believe, though, that if I stay in the midwest, this position of mine may hinder my job prospects, strictly because of the vast majority of boys getting them done. WE'll see.