Christian worship is about participating in the life of God himself: Father, Son, and Holy Spirit.  In the liturgy of the Church you and I come face to face with our Creator, Redeemer, and Sustainer.  As we participate in God's life, we are changed by it.  We sing it.  We pray it.  Our bodies move with its rhythms: making the sign of the cross, bowing, kneeling, the raising of hands.  This is particularly clear in the Sacraments of the Church: we feel the grace of God pouring over our heads in the waters of Baptism.  We taste, touch, and smell the grace of God in the Eucharist, the real presence of Jesus Christ, his body and blood, soul and divinity.