“Yes, obviously. However, Catholicism and Protestantism aren’t enemies. We are all one Body under the Headship of Christ.”
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Not exactly true. Only those Catholics and Protestants and others who have been authentically born again of the Spirit of God are part of the Body of Christ.
Denominational and traditional affiliations, Catholicism, Protestantism and etc. will get you nowhere with God.
“You must be born again.”
This "born again" is baptism. However, baptized Christians at times fall away from the Catholic Church for a variety of reasons.