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Pentecost
Pentecost is the birthday so that's it.
Pentecost
Pentecost Sunday is considered the birthday of the Church.
The 'birthday' of the Church, as at Pentecost the Holy Spirit came upon the disciples of Jesus and after that moment they began to go out and preach the gospel, forming the Christian Church
Easter is the second most important day of the Church year. The most important feast day is Pentecost. Had there been no Pentecost, when the Holy Spirit descended upon the Apostles, the Church would never have gotten off the ground. Pentecost is considered the birthday of the Church. So Easter and Pentecost are both important feast days in the Catholic Church.
Pentecost Sunday in about the year 33 AD. is considered the birthday of the Catholic Church.
On Pentecost the Holy Spirit descended upon the apostles giving them the stimulation they needed to begin preaching the Gospel. Pentecost is the birthday of the Church and, had it not happened, the Church never would have gotten started. It would have died out quickly.
Shavuot (not "Pentecost") celebrates the Giving of the Torah.
Apostolic Church of Pentecost was created in 1921.
The most significant feast day is Pentecost as it is the birthday of the Church. It is followed by Easter and Christmas.
The birthday of the Church is considered to be Pentecost - fifty days after Easter, the day the Holy Spirit descended on the Apostles in the upper room.