Are you sure calvin was not referring to the Holy cathlic Church, in the sense of the true saved of God?
Hard to believe a fervant reformer would end up agreeing with same church that he saw as being NOT taeching the true Gospel of Christ!
You really should read the institutes of Christianity. Even after the reformation was under way Calvin place his daughter in the care of Nuns in a convent because he couldn't take care of her being so busy and all. You would be sadly mistaken if you believe Calvin wasn't a true Catholic. He was he just disagreed with the way the church was going. So he moved to Geneva and worked real hard to form his own Catholic church with him as pope.
MB