Patriot lives Matter

Who cares what they think?

The Constitution isn't an Ecumenical Creed

It is now

No its not, it's absolutely not.
The Constitution has nothing to do with the teachings of the Church, and was not created by a council of Bishops. It did not defeat a heresy, and it did not define any major teachings.

You said that the Sacraments (Eucharist) don't matter, or at least you implied it. That's Calvinist/Puritan heresy.

Yeah. I'm not Catholic, but the Eucharist is definitely not "pagan". No such practices existed before, and the Catholics even deny the faithful ones of the Species (The Body of Christ). It's Biblical too, which is why it's surprising why the fundamentalist branch rejects it so vehemently.
The word "heretic" has the same heavenly consequences as it always had, for it is written that "though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed" (Galatians 1:8) and Christ Himself said to "beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves" (Matthew 7:15).
I would be wary of calling a Saint (Augustine of Hippo) a heretic, for they were great in the eyes of our Lord, and we were able to "recognize them by their fruits…” (Matt. 7:16).
I'll leave you with a quote from the Holy Scriptures and a nice article on the Holy Eucharist: "I am the living bread which came down from heaven; if anyone eats of this bread, he will live forever; and the bread which I shall give for the life of the world is my flesh (Jn 6.51)."
https://www.oca.org/orthodoxy/the-orthodox-faith/worship/the-sacraments/holy-eucharist

Your "simple google search" did not give back any obvious answers proving me wrong. The "pagan Eucharist", as done with the bull of Mithras, is taken from Christianity/Judaism. When we take the Body and Blood of Christ, we become "a part of Him" and will "receive eternal life because of Him" (John 6:54-57)
I do say a lot of things that come from Orthodoxy (God-Willing), because it is the one true Holy Apostolic Faith, as given to us by our Lord Jesus Christ. Rather, it is you who speaks of non-Christian things, for you deny the Most Holy Body and Blood of Christ (For it is supported by Holy Tradition; both by the Scriptures and the Miracles of the Church). There was a story from the life of Saint Anthony the Great, where there was a righteous man who believed that the Eucharist was a mere metaphor. When he prayed in the church for God to not let him err from ignorance, the monks and him saw the literal Body and Blood of Christ being delivered by the Angels. Thusly, the man was redeemed, and Christ has taught us that there shall be no heresy tolerated by this issue. Please do not err from ignorance, and let the Orthodoxy of the Church's tradition convince you.
Saint Augustine of Hippo was a saint, and to reject this is to reject the decisions of the Church, which will result in Anathema (For Christ our God said that "… if thy brother shall trespass against thee, go and tell him his fault between thee and him alone: if he shall hear thee, thou hast gained thy brother. But if he will not hear thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established. And if he shall neglect to hear them, tell it unto the church: but if he shall neglect to hear the church, let him be unto thee as a heathen man and a publican. Verily I say unto you, whatever ye shall bind on earth shall be bound in heaven; and whatsoever ye shall loose on earth shall be loosed in heaven" in Matthew 18:10–18)
Hell, if I understood the teachings of the Church properly, is not a place of eternal, never-ending torment, but of our souls constant rejecting of Christ. What do you imagine Hell is?