This page is still under construction, but here are some helpful quotes.
The Councils of Vienne (1311-1312) and Florence (1431-1449) both declared that circumcision must not be practiced by Christians.
The modern Catholic Catechism states that “Except when performed for strictly therapeutic medical reasons, directly intended amputations, mutilations and sterilizations performed on innocent persons are against moral law.”
In 1952, Pope Pius XII said, “From a moral point of view, circumcision is permissible if, in accordance with therapeutic principles, it prevents a disease that cannot be countered in any other way.”
In 2007, Pope Benedict XVI called the Church “a Church without circumcision.”