What exactly do you think Jesus meant when He said in John 6:14-15 for example. "And as Moses lifted up the serpent in the wilderness, so must the Son of Man be lifted up, that whoever believes in him may have eternal life."
That is Catholic belief but it denies the sufficiency of Christ. In fact your whole religion does the same thing. And to make matters worse, it claims that only the Catholic religion and their rituals can save. The entire institution is an idol.
No one has faith without the grace of God giving it. "It is by grace you are saved, through faith, and that is not of ourselves but is the gift of God." Which is more reliable? What God says or what the RCC says? The grace spoken of in that passage means that no one, no matter what they do to try and attain favor and reconciliation with God (justification) they will fail. Even those He foreknows, predestines, calls, justifies, and glorifies---those He gives to Jesus---- don't deserve reconciliation and justification. It is of grace. The passage does not say faith and anything else. We cannot persevere in grace. Grace is not ours to persevere in. Grace belongs to God, the Creator of all that is.
They do not oppose faith alone, they are discussing other elements. I did not read them all because you interpret them as proof texts, and so convinced are you that whatever the RCC says is what God says, instead of the other way around (the RCC standing in the temple of the Lord, His people, and declaring itself to be God) that you actually think you have made your case. But, if you would please, take just the first three proof texts you give and present a thorough exegies of them---using only the whole counsel of God. Use proper hermeneutics in doing so and do so only consulting the Bible itself, not RCC dogma. If you can't do that, neither you or your religion have a leg to stand on.
Jn 6:50 This is the bread which cometh down from heaven, that a man may eat thereof, and not die.
51 I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world.
52 The Jews therefore strove among themselves, saying, How can this man give us his flesh to eat?
53 Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you.
54 Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day.
55 For my flesh is meat indeed, and my blood is drink indeed.
56 He that eateth my flesh, and drinketh my blood, dwelleth in me, and I in him.
57 As the living Father hath sent me, and I live by the Father: so he that eateth me, even he shall live by me.
58 This is that bread which came down from heaven: not as your fathers did eat manna, and are dead: he that eateth of this bread shall live for ever.
59 These things said he in the synagogue, as he taught in Capernaum.
60 Many therefore of his disciples, when they had heard this, said, This is an hard saying; who can hear it?
61 When Jesus knew in himself that his disciples murmured at it, he said unto them, Doth this offend you?
62 What and if ye shall see the Son of man ascend up where he was before?
63 It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.
64 But there are some of you that believe not. For Jesus knew from the beginning who they were that believed not, and who should betray him.
65 And he said, Therefore said I unto you, that no man can come unto me, except it were given unto him of my Father.
66 From that time many of his disciples went back, and walked no more with him.
67 Then said Jesus unto the twelve, Will ye also go away?
68 Then Simon Peter answered him, Lord, to whom shall we go? thou hast the words of eternal life.
They took it literally and he did not say oh boy’s don’t go away I only ment it figuratively! No he turn the apostles and ask do also wish yo leave?
Does not deny the sufficient grace of Christ! All grace comes from Christ but not all at one time! Jn 1:16
Everytime Peter or Paul greets the faithful they say grace be unto you! Why if you don’t need any more grace?