Calvin on the Validity of “Romish” Baptism

Clearly, the revolutionary Anabaptists had broken with the Historic Christian Church altogether.  The Romanists had not.   Yet they were indeed, as Calvin then called them, "the internal enemies of the Church."  For although they constantly continued "boasting mightily of the Gospel of Christ -nevertheless, they rush against me with greater impetuosity than against the open adversaries of the Church."

Why?  According to Calvin, "because I do not embrace their gross and fictitious notion concerning a carnal way of eating Christ in the sacrament."   Thus, not baptism but the mass — was the great watershed between Romanism and Protestantism.