I realize kids shouldn't always get their way, but if the boy has suffered infection and discomfort I think he should be heard and allowed to have relief. I've never heard any information that would cause me to think it's harmful to have a circumcision. I would think he'd rather be comfortable than [imagine alternative.]
It has been known for decades in all reasonable circles that circumcision is a wise choice, and, for some time, it was done as a matter of course. Those who hold with a different view need to be questioned carefully. Chances are they are, not only fools, but slaves to some bizarre religious conviction.