Yes, of course you’re right.
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The First Council of Nicaea was convened in the year 325 AD.
It began on July 4, 325, and lasted for about two months. The council was called by Roman Emperor Constantine the Great and brought together approximately 300 bishops from across the Roman Empire.
Except that the Church had bishops for 300 years before hand and there was a bishop in Rome since the time of Peter. No, the Catholic Church started with Jesus Christ.
or let me take a more basic fact -- you, R2nd, wrote brought together approximately 300 bishops from across the Roman Empire.
The fact that there were bishops and this invitation was sent to the Bishop of Rome, should tell you that there ALREADY WAS a hierarchical structure, an episcopate in place
Did you ever stop to think THAT?
Eusebius (Life of Constantine 3.7) and other sources confirm that Vitus and Vincentius, priests sent by Sylvester, represented the Roman see. Their presence is noted in the council’s proceedings, and they signed the Nicene Creed and canons on behalf of Rome, indicating papal endorsement.
Irenaeus in his 180 AD Against Heresies wrote that the bishop of Rome held a position of honor due to the city’s apostolic foundation by Peter and Paul --> this was acknowledged by the Council of Nicaea’s Canon 6
The council’s decisions, including the Nicene Creed and the condemnation of Arianism, were sent to Rome for approval, as noted by later historians like Sozomen Ecclesiastical History c 440 AD
Do you even know WHAT was discussed?
The major impetus for the calling of the Council of Nicaea arose in a theological dispute among the Christian clergy of Alexandria concerning the nature of Jesus, his origin, and relation to God the Father
The Trinity was already acknowledged but Arius taught a lighter form of adoptionism
ordination of a bishop in the presence of at least three provincial bishops and confirmation by the metropolitan bishop
These should tell you that the structure was already in place - as evidenced in 1st and 2nd century writings.
So conclusively, the Church was formed in the 1st century at Pentecost.