Brother, You are in a state of denial. St. Cyprian, a Bishop of the Catholic Church, quoted three times in the quotes that I provided below, was a bishop before Constantine the Great was even born.
No history book supports your theory.
Those who go off to heretics, and all who leave the Church for heresy, abandon the name of Christ. Those who call these men "Christians" are in grievous error, since they neither understand Scripture at all nor the faith which it contains. St Athanasius ("Discourse Against the Arians", Bk. I, ch.1,no.1, pg 26:11)
In name only is Christ found among certain heretics who want to be called Christians
He who falls away from the doctrine and faith of the Catholic Church would not be, nor would even be called, a Christian. (St. Athanasius)
All true Christians are members of the Church. (St. John Eudes)
Whosoever and whatsoever he might be, he who is not in Christ's Church is no Christian! (St. Cyprian)
A manifest heretic is not a Christian, as is clearly taught by St. Cyprian, St. Athanasius, St. Augustine, St. Jerome, and others. (St Robert Bellarmine)
Many will come in My name, saying: "I am Christ," and they will seduce many. Many will say to Me on that day: "Lord, Lord, have we not prophesied in Thy name and cast out devils in Thy name and done many miracles in Thy name?" Then will I profess unto them: Depart from Me, you who work iniquity; I never knew you! St Matthew 24:4-5, 7.21-23
Pope Pius IX, Etsi multa (#25), November 21, 1873: “Therefore the holy martyr Cyprian, writing about schism, denied to the pseudo-bishop Novatian even the title of Christian, on the grounds that he was cut off and separated from the Church of Christ. ‘Whoever he is,’ he says, ‘and whatever sort he is, he is not a Christian who is not in the Church of Christ.’”
“Brother, You are in a state of denial. St. Cyprian, a Bishop of the Catholic Church, quoted three times in the quotes that I provided below, was a bishop before Constantine the Great was even born. “
Like I said, “Catholic” in that context means “universal”, not “Roman Catholic”.
You know, a lot of Catholics on FR try to weasel out of saying that the Catholic Church teaches that those who are not Catholic are not Christian and not going to heaven.
We can all see now that it IS what the Catholic church teaches.
Thanks for clearing that up for us.