All Protestants affirm the Trinity of Three Persons in One God, a concept very hard to understand. Calvinist focus on the First-Person God the Father. Lutherans emphasize the Second-Person God the Son. God the Spirit has been much neglected mostly because his role as Lord and Giver of church life was not needed when lively church life was heavily institutionalized. The rapidly growing Pentecostal movement of the last 100 years features the Third-Person Spirit. For Paul Christ and the Holy Spirit are inter-changeable. He attributes the same function in one place to Christ and another place to the Spirit. For Paul the Spirit is Christ present with us now.