I've been to mass. Idols everywhere. Necromancy in the form of venerated "relics" that are actually body parts of the dead.
Nuns under glass said to be preserved in their bodily form because they were special in God's sight.
The invention of $Purgatory$ and,until it was deemed closed by former Pope Benedict, Limbo.
None of those things were taught by Jesus.
Trace this brief history of the Roman Catholic Church and learn how one of the oldest and largest branches of Christianity was established.
www.learnreligions.com
official beginning of the Roman Catholic church occurred in
590 C.E., with Pope Gregory I.