The church who preaches this is the Church.
The church who adds to this is NOT the church.
Roman Catholicism cannot, no matter how badly it wants to, cannot point to Scripture and show all of its beliefs. Hence Roman Catholicism is NOT the church founded by Christ and preached and written about by the Apostles.
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Since, therefore, the tradition from the apostles does thus exist in the Church, and is permanent among us, let us revert to the Scriptural proof furnished by those apostles who did also write the Gospel, in which they recorded the doctrine regarding God, pointing out that our Lord Jesus Christ is the truth, and that no lie is in Him.
Irenaeus of Lyons. (1885). Irenæus against Heresies. In A. Roberts, J. Donaldson, & A. C. Coxe (Eds.), The Apostolic Fathers with Justin Martyr and Irenaeus (Vol. 1, p. 417). Buffalo, NY: Christian Literature Company.