There is a very good reason for the feast of Pentecost to be called the birthday of the Church. It is the beginning of the work of the Apostles and other followers of Jesus to take the Good News into the streets. The Gospel is preached and many converts were made that day.
It is interesting how God works, in the Bible it was the feast of Pentecost, the Feast of Weeks, a great feast in the calendar of ancient Israel celebrating the giving of the Law to Moses on mount Sinai. This was the feast that was being celebrated when the disciples received the Holy Spirit. If we go back to the book of Exodus and read the text concerning Moses bringing down the stone tablets that the Ten Commandments were written on by the hand of God, we see that the Jews had fallen into sin, disobeying the very first commandment, worshiping a golden calf and engaging in other serious sin. In punishment for these grave sins three thousand of the people were put to death.
Fast forwarding to the feast of Pentecost when the Apostles were in the upper room, after they had received the Holy Spirit and went out and preached the Good News the Scripture says that three thousand people were added to the faith that day! The healing power of the Holy Spirit is seen in these texts. God takes a rupture in His love for His people and upon the accomplishment of His Son over death by His resurrection and Ascension into Heaven has sent the Advocate to the Apostles to heal that break and to draw His people even closer to Himself than ever before.
The Holy Spirit can work that way within us as well, He can take the breaks in our relationship with God and make them right. Through the Sacraments, especially those of Confession and the Eucharist, God, through the Holy Spirit heals us and brings us closer to the Lord.
So as we celebrate this joyful birthday of The Church let us keep in mind the powers and the gifts of the Holy Spirit and may we tap into those gifts and live our lives as God intends us to live them by loving God and our brothers and sisters with all of our being. Amen.
Your servant in Christ,