After 12 pages, the definitive answer is that circumcision is based on nothing with the Roman Catholic religion. It all depends on where you are in the world and the standards, at the time, on whether RCs are cut. In North America, in the 50s through to the 70s, probably 80% were getting cut. Nowadays it's probably the reverse. The only religions I know, that subscribe to circumcision, are Jewish and Muslim. Europe was never big on it...not sure of other continents.