I am an atheist and I didn't circumcise my two DSs, but I did inflict pain and mutilation on both my younger DC when they were too young to consent fully- they had to have surgery when they were small. In one case, removal of a pre-cancerous growth and relocation of the testes; in the other, grommets. I would circumcise if I thought there was a sound medical reason.
What is it that circumcision promises me? the World Health Organisation recommends it specifically for prevention of HIV, alongside condoms and fewer sexual partners. It doesn't say if just condoms and sexual restraint works just as well. My DC are at lower risk of HIV as we don't live in a high risk area. Mmm, pass.
Studies show less risk of STIs. Mmm, possibly worth it. But surely better to use a condom and/or be faithful and wash a bit? Pass.
Studies show less risk of UTIs. Mmmm, a bit trivial, they can take antibiotics. Pass.
Studies show less less risk of penile cancer. Mmm, interesting. How common is penile cancer, and what's the reduction in risk? Ah. You say it is incredibly rare, CRUK? 550 men a year, usually over 60, in the UK, you say? and that smoking is a bigger risk factor than circumcision, as is HPV infection? And that Israeli Jews get 1/3 the rate that British men do- so circumcision only reduces risk, it doesn't eliminate it? hmmm, pass on the whole I think.
Doesn't quite reach the necessary standard for surgery to babies, not for me, I'm afraid.