Upon the death of Jesus Christ on the cross, the old sacrificial laws were fulfilled for the last time. We now utilize the sacraments of baptism and the Lord's Supper to remember that the promises of old were fulfilled. The worship life of the Presbyterian church focuses on recognizing each person in the Godhead. God the Father, God the Son and the God the Holy Spirit are all to be worshipped, but not angels, saints or the Virgin Mary. The Presbyterian church recognizes only two sacraments, baptism and the Lord's Supper.
Baptism involves the pouring of water over the head, there is no immersion.
The Lord's Supper is a way in which we commune with God following baptism. Doctrine holds that the wine and bread are merely wine and bread, there is no transubstantiation. The elements are not to be worshipped. Prayer is to be used only for the living. It is not necessary to pray for the souls of the dead because they are already in heaven or hell.