Praying to Mary.
Praying to Saints.
Confessing sins to Priest.
Infant Baptism (as a means of salvation)
Communion (as a means of salvation)
Bowing (worship) of statues, and so-called "Holy Relics."
ALL of these things (and many other Catholic rituals) are completely debunked, (some- outright FORBIDDEN) in the Bible, which is why Protestants LEFT the church of Rome in the first place.
You DO NOT know your Bible as well as a Protestant, or you would no longer be a Roman Catholic.