Today is the 49th day of counting the Omer. It is the 7th Sabbath since the Feast of First Fruits. Tomorrow is the feast of Shavuot… day 50. In History, Shavuot is the day that YeHoVaH gave the Torah to Moses and Israel, the Qahal Spirit fell on the disciples with tongues of fire and Israel was reborn in a day all on Shavuot. All of this is according to our Creator’s calendar based on the sighting of the new moon.
If any of this is a mystery to you, then your church is concealing historical information and lying to you.