Bro, you're post is so wrong on so many levels.
I can see your seminary training did not equip you to handle the Scriptures. You may can recite the Mass in Latin, but you cannot handle the Scriptures.
Read John 6:66 in context.
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60Therefore many of His disciples, when they heard this said, This is a difficult statement; who can listen to it?
61But Jesus, conscious that His disciples grumbled at this, said to them, Does this cause you to stumble?
62What then if you see the Son of Man ascending to where He was before?
63It is the Spirit who gives life; the flesh profits nothing; the words that I have spoken to you are spirit and are life.
64But there are some of you who do not believe. For Jesus knew from the beginning who they were who did not believe, and who it was that would betray Him.
65And He was saying, For this reason I have said to you, that no one can come to Me unless it has been granted him from the Father.
66As a result of this many of His disciples withdrew and were not walking with Him anymore.
67So Jesus said to the twelve, You do not want to go away also, do you?
68Simon Peter answered Him, Lord, to whom shall we go? You have words of eternal life.
69We have believed and have come to know that You are the Holy One of God.
John 6:66-69 NASB
What he DIDN'T say:
If the Eucharist is only a symbol as most protestants believe, and by now most Catholics who have lost their faith, why did Jesus let these disciple go away. In fact Jesus was even willing to lose all of his Apostles so as to remain faithful to the divine truth that does not change and does not come from the wisdom of man, as you quoted: So Jesus said to the twelve, You do not want to go away also, do you? (Jn 6:67).
The great majority of Catholic priests and bishops today are now doing as most Protestant pastors have done all along, to preach according to what the people want to hear, human respect before the truth. Very few pastors in this period of the great tribulation (Mt 24:21) when the Body of Christ, the Church, will be crucified (CCC 675-677), will be willing to follow Christ all the way to be humiliated and crucified by not compromising with the Truth of God, not the truth of the world.