<Li> In the New Testament: "The LORD our God is one ." </Li> <P> In the Trinitarian view, the Father and the Son and the Holy Spirit share the one essence, substance or being . The central and crucial affirmation of Christian faith is that there is one savior, God, and one salvation, manifest in Jesus Christ, to which there is access only because of the Holy Spirit . The God of the Old Testament is still the same as the God of the New . In Christianity, statements about a single God are intended to distinguish the Hebraic understanding from the polytheistic view, which see divine power as shared by several beings, beings which can and do disagree and have conflicts with each other . </P> <Table> <Tr> <Td> The Father Son Holy Spirit The "Shield of the Trinity" or Scutum Fidei diagram of traditional medieval Western Christian symbolism </Td> </Tr> </Table> <Tr> <Td> The Father Son Holy Spirit The "Shield of the Trinity" or Scutum Fidei diagram of traditional medieval Western Christian symbolism </Td> </Tr>

What is the origin of the trinity doctrine