Because the Church doesn’t save, Mark. Belief that Christ died for your sins, and His death is all sufficient for your salvation is what saves. Strangely absent from the RCC.
Interesting choice of wording. The Church was created to teach and to evangelize to the world.
Matthew 28: 18 11 Then Jesus approached and said to them, "All power in heaven and on earth has been given to me. 19 Go, therefore, 12 and make disciples of all nations, baptizing them in the name of the Father, and of the Son, and of the holy Spirit, 20 teaching them to observe all that I have commanded you. 13 And behold, I am with you always, until the end of the age."
That was not given any Tom, Dick or Luther. It was given specifically to the Apostles.
If you have no clue as to what Jesus is and does, that is not salvific. The Church was promised that Jesus will be with us always. Those who choose to walk away from the Church walk away from God. Those who believe as they will violate the repeated commands in the NT to believe as the Church describes. And at what point, does your own belief system violate the basics of Christianity which the Judge will determine at your Judgement? How much variation will He tolerate from Christianity?
Simply taking upon yourself the authority of determining your own beliefs puts you at variance from Christianity.