Mormonism sprang up l,800 years after Catholicism and 200 or so years after Protestantism and they don't like either.
Catholics are protected from error by Christ's promise to them, what you bind on Earth will be bound in Heaven and what you loose on Earth will be loosed in Heaven......do you think that He would have made that promise and then allowed errors to be promulgated????
prayer for the dead, worship of saints, a pagan magic act called Mass, worship of Mary (that one was put in your religion about 432AD), the doctrine of purgatory, the service mandated to be in Latin, celibacy of the 'priesthood' (that one came a thou8sand years after the fact, 1074), etc. Yes, you are in a religion created by men over centuries, to empower the org you call Mother Church (seen described in Revelation 17).
The book that Rome assembled proves your statement to be wrong:
These WERE Catholic; right?
They WERE in error; Right??