On the day of Pentecost in Jerusalem in (about) the year 33 AD.Answer
Catholic Church was established by Jesus Christ when he said to the Apostle Peter: "I give you the KEYS to the Kingdom of Heaven and whatsoever you shall bind on earth shall be bound in heaven and whatsoever you shall loose shall be loosed in Heaven" AND more definitively at Pentecost and then more definitively just prior to Jesus' Assension when He declared to all the Apostles: "and then He (Jesus) breathed on them and said: 'receive The Holy Spirit. If you forgive men's sins they are forgiven them; if you hold them bound they are held bound" and other related scripture passages in which Jesus commissioned the Apostles, specifically (not all of his desciples) to preach the "good news" -- salvation through Christ.
And, Jesus also declared: "I will never leave you; I will be with you always." Well, always is always; never is never. Therefore, NEVER did Our Lord leave or abandon His Church on earth -- the Holy Catholic Church. He said he would not and therefore he did not. The Christian FAITH is now, and always has been, preserved in Truth, infallibly, by Christ Himself in every century and at every moment for the past 2000 years.
Thus, the Christian FAITH never needed "reform" nor "restoration." Human beings -- administrators of the Faith (priests, bishops, pastors, etc.) have ALWAYS been falible in their personal lives. Only the FAITH itself -- the teaching on faith and morals -- is protected by The Holy Spirit (in every age, at every moment) from error. Human beings are fraught with error. Plenty of theological and moral errors have been taught & preached, to this day, all over the planet. Christian history is fraught with multiple schisms & heresies over the past 2000 years. Sometimes heresies were very successful (i.e., Arian heresy in the 4th century) but they NEVER prevailed. The Truth ALWAYS prevailed in the Catholic Church. . .b/c Jesus promised it would.
Besides -- can't be judged by The Truth (in justice; and God is just) UNLESS The Truth/True Faith does exist and CAN be known. Obviously we can't be justly judged (individually and in every generation) according to Truth/Faith if it isn't known. Ergo, the Catholic Church contains the "Fullness of Truth" (faith and morals) that God has deigned to reveal to mankind.
IMO, it simply can't be any other way . . .and it's pretty obvious it can't. It it were, then we'd be stuck, as Christians, accusing Our Lord Jesus Christ of lying. He doesn't and did not. Jesus, through the Holy Spirit, NEVER left us, His Church (bride) not even for a milla-second. Never is never.
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