Quickly realized what the Catholic Church teaches is not in the Bible? It’s important to not study Catholicism without proper Catholic guidance.
We don’t need a man to explain to us what the Bible says, that’s why Jesus gave us the gift of the Holy Spirit. (Acts 1:8)

The Bible says, “The man without the Spirit does not accept the things that come from the Spirit of God, for they are foolishness to him, and he cannot understand them, because they are spiritually discerned.” (1 Corinthians 2:14)
The Holy Catholic Church is the oldest and original Christian Church.
The original church began when the disciples were born again through the power of the Holy Spirit and Jesus told them to witness “to the ends of the earth”. The “church” is the body of Christ, not a building.
“But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth.” (Acts 1:8)
It is the Body of Christ, and as an organic, human and divine institution we should hardly hope it to be stagnant.
The Bible says that the Body of Christ is every believer, not members of a man-made church.
“So in Christ we who are many form one body, and each member belongs to all the others.” (Romans 12:5)
It grows and evolves and has done so within the same framework since Penetecost.
The Catholic Church grows and evolves but the Bible says that God never changes, and that the Word of God never changes.
“Every good and perfect gift is from above, coming down from the Father of the heavenly lights, who does not change like shifting shadows.” (James 1:17)
“The grass withers and the flowers fall, but the word of our God stands forever.” (Isaiah 40:8)
It doesn’t matter what church you go to, what matters is that you’re born again of the Holy Spirit. Jesus said, “I tell you the truth, no one can see the kingdom of God unless he is born again.” (John 3:3)
"Jesus answered, "I tell you the truth, no one can enter the kingdom of God unless he is born of water and the Spirit. Flesh gives birth to flesh, but the Spirit gives birth to spirit.
You should not be surprised at my saying, 'You must be born again.’ " (John 3:5-7)
