If Christ Jesus did established one Church, and left that Church with a succession of leadership, the Catholic Church is the ONLY Church that can prove in every verifiable way that it is that Church. For example, clearly the 1st and 2nd Century Church believes that the Holy Eucharist is the Real Presence of Christ. There is only one Church teaching that today. Clearly, the Baptism of Regeneration is a 1st and 2nd Century belief. Only ONE Church teaching that today. Only one Church can document its existence for nearly 2,000 through a paper trail of people who have served as bishop in the Sees of Rome, Antioch and Egypt. It goes on and on.
The troubling error that is present in first article is that the Church doesn’t believe in Scripture alone. Even the Bible doesn’t teach Scripture alone. You can’t argue against Football using Baseball rules.
Then, again, the plain error in your second article is blatant cherry-picking and some agenda to prove your belief. I know this wasn’t a scholarly attempt, so I won’t press you hard here, but your effort was lacking.
Ask yourself, was Jesus a brass snake on a pole, as He taught Nicodemus n John 3? That scene in Numbers 21 is nowhere explained in the Old Testament. it is not until ohn 3 where Jesus is teaching Nicodemus that we see Whom the brass serpent on the pole is to foreshadow. In the same typology, the unleavened bread broken and given tot he disciples and the cup of wine passed among the disciples is a foreshadowing of what Jesus is about to do for them. At Passover the night before His crucifixion Jesus was not contradicting a command given BY GOD through Moses in Leviticus 3:17, for Jesus was not drinking His own blood and giving it to His disciples to drink.