The Day of Pentecost is especially significant to Christians because on the first Pentecost after Jesus Christ's death, God established the New Testament church through the giving of the Holy Spirit. What is the church? What is special about the church? What makes up God's church? The word "church" is used throughout the New Testament to refer to those people who are called by God to receive salvation through Jesus Christ. There are promises that God has made to the church which are important to remember and consider on the Feast of Pentecost.