Roman Catholicism says: Scripture and Tradition together are equal.
The New Testament says: Scripture alone is the Word of God (John 10:35; 2 Timothy 3:16,17; 2 Peter 1:20,21; Mark 7:1-13).
Roman Catholicism says: Mary is the co-redeemer, for she participated with Christ in the painful act of redemption.
The New Testament says: Christ alone is the Redeemer, for He alone suffered and died for sin (1 Peter 1:18,19).
Roman Catholicism says: Mary is the co-mediator, to whom we can entrust all our cares and petitions.
The New Testament says: Christ Jesus is the one mediator to whom we can entrust all our cares and petitions (1 Timothy 2:5; John 14:13,14; 1 Peter 5:7).
Roman Catholicism says: The Roman Catholic Church is necessary for salvation.
The New Testament says: There is salvation in no one but the Lord Jesus Christ, “for there is no other name under heaven that has been given among men by which we must be saved” (Acts 4:12).
Roman Catholicism says: Each sacrifice of the Mass appeases God's wrath against sin.
The New Testament says: The once-for-all sacrifice of the cross fully appeased God's wrath against sin (Hebrews 10:12-18).
Roman Catholicism says: The sacrificial work of redemption is continually carried out through the sacrifice of the Mass.
The New Testament says: The sacrificial work of redemption was finished when Christ gave His life for us on the cross (Ephesians 1:7; Hebrews 1:3).
“Jesus replied, "Blessed are you, Simon son of Jonah, for this was not revealed to you by flesh and blood, but by my Father in heaven. And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it.” Mat 16:17-18
What part of "I will build my Church" don't you understand?