Excommunication within the Catholic church can only be done with those who are Catholic. Also, are you sure that the "flaws" are in reality "flaws" or maybe just a difference of opinions?
Catholics believe in human sacrifice to a God. They are appalled if an Aztec does it, but feel they attain perfection if they do it.
They believe the Command from God not to kill. They believe God is true justice. But then they think that God demands the death/murder of His innocent Son for crimes he did not commit. That breaks a Command from God and is not justice, it is inequity, injustice. They turn God from being a righteous, loving God into being an unrighteous, unloving tyrant that demands people to agree with murder for a reward.
Worshipping that concept of a God turns people into criminals, sinners, for agreeing an innocent, loving man should die.
In the beginning, the 2 men that worshipped the Living God, our Creator, was Jesus and John the Baptist, not Abraham and Moses.
God sent John for one purpose and that was to teach forsake belief in blood sacrifice to remove sin and accept water baptism for removal of sin. It was a Commandment from God to believe in Water Baptism, not optional for salvation. If the Jews had accepted water baptism, then the murder of Jesus would have never happened.
This is what Jesus said about killing him.
John 6:70
"Jesus answered them, Have not I chosen you twelve, and one of you is a devil?"
Judas is a devil for believing an innocent man should die so Judas receives a reward for it.
In John 8, "
Jesus answered them, Verily, verily, I say unto you, Whosoever committeth sin is the servant of sin."
Killing an innocent man is sin and those that believe in it are servants of sin.
40 But now YE SEEK TO KILL ME, a man that hath told you the truth, which I have heard of God" The command of God is believe merciful water baptism not actual blood removes sin. But the deeds of their fathers based on Abraham was to believe in killing people that opposed their religious beliefs. They WERE doing the deeds of Abraham their father; Jesus hears the voice of God not Abraham.
Blood sacrifice for sin removal was established in Jewish laws by Abraham. Jesus denies blood sacrifice/murder in the true doctrine words of God and said,"
And because I tell you the truth, ye believe me not." The "blood" of Jesus that washes sin away is belief in water not death/sacrifice for forgiveness of sin. His blood is true doctrine=the Words of God that save people.
Abraham is the father of the lie that God accepts human sacrifice for sin removal. Abraham rejoiced in the day his sons kill Jesus because then Abraham's lies are believed as truth and Abraham remains exalted and honored for his deceptions.
One of Abraham's sons, Pharisee Paul leads people back into Jewish beliefs and tells people to believe in bloody Human Sacrifice.