>>12957091>>12957091https://www.youtube.com/watch?v=7F8ZRfUpcJUWatch if you're actually interested in a well done answer to your question.
TLDW: Catholics claim Peter was the first pope when the "foundation" of the church was referring to Jesus and not Peter. Also as the first pope peter was married - priests etc. in Catholicism aren't supposed to be.
They worship Mary, and believe she was a virgin forever, although her and her husband Joseph had multiple children.
They call priests "father" when there is only one father.
They teach salvation is through works and not faith.
For it is by grace you have been saved, through faith—and this not from yourselves, it is the gift of God—not by works, so that none can boast.
EPHESIANS 2:8-9
Arguably, the whore of babylon is the catholic church.
Revelation 17
8The beast that thou sawest was, and is not; and shall ascend out of the bottomless pit, and go into perdition: and they that dwell on the earth shall wonder, whose names were not written in the book of life from the foundation of the world, when they behold the beast that was, and is not, and yet is. 9And here is the mind which hath wisdom. The seven heads are seven mountains, on which the woman sitteth. 10And there are seven kings: five are fallen, and one is, and the other is not yet come; and when he cometh, he must continue a short space. 11And the beast that was, and is not, even he is the eighth, and is of the seven, and goeth into perdition. 12And the ten horns which thou sawest are ten kings, which have received no kingdom as yet; but receive power as kings one hour with the beast. 13These have one mind, and shall give their power and strength unto the beast.