Trinity Sunday is today, the first Sunday after Pentecost to honor or celebrate the Holy Trinity – The Father, the Son, and the Holy Spirit. It is celebrated as a doctrine that can be summarized in four points: (1) The Father is God, (2) Jesus Christ is God, (3) The Holy Spirit is God and (4) There is only one God. The mystery of the Trinity is that God is somehow three Persons (Father, Son and Holy Spirit) and yet there is only one God (Godhead).