Back to this relevant point. Is there a law against a person putting a kid's willie in their mouth? If there is, then the person doing it can be arrested and charged. This is standard procedure. Hell, just possessing a picture of the person doing this could put somebody in jail.
And let's go ahead and state the obvious: these guys are most likely pedophiles who are using religion as an excuse. There is not, and has never been a medical justification for this practice whatsoever. It's the opposite. It's dangerous, sometimes fatal.