Frankly, I’m not sure how anyone can mistake Roman Catholicism for true Christianity as defined in Scripture. The church is chock full of false teachings (plural, many) nearly from top to bottom.
The Roman Catholic Church is like a house of mirrors maze at a carnival or amusement park (although much more eternally deadly for people) – it is chock full of false teachings, Bible misinterpretations, vain repetitious babbling, lifeless rituals, schemes of man, mysticism, occult and pagan practices and beliefs, blasphemous words and man-made traditions, mixed into an appearance of and masquerading behind a thin veneer of pretend/fake Christianity.
Keep in mind that Roman Catholicism evolved out of mixing pagan beliefs with elements of Christianity, and Catholicism began several hundred years after Christ; part of the deception of the Popery is their “perceived”/claimed association with the early saints and apostles such as Peter and Paul.
The Roman Catholic Church is simply a political/economic entity; it has as much resemblance to true Christianity as ancient pagan Babylon does.
There are many materials and books which discuss the errors of Catholicism (Popery), so please seek them out. Simply put, it’s a scheme of man-made “rules” which are in contradiction to the teachings of Scripture, and once again (as in Babel, Babylon) seeks to elevate man to the position of God. False teachings include (but are not limited to):
- The Eucharist being Christ’s body literally
- Paying penance
- Selling “indulgences” (sins)
- Pope as god on earth (blasphemy)
- Mandated celibacy
- Salvation is earned by “meritorious acts”
- Other man-made rituals and delusions