Martin Luther examined the work of the members of the Holy Trinity in his own life in his book, "Sermons on the Catechism." He wrote, "Therefore, from the Father I receive creation, from the Son redemption, from the Holy Spirit sanctification." Jesus of course had a prominent place in the history of the Church.
The first creed was probably simply "Jesus is Lord." The Apostles' Creed gave us a further statement of belief as did the Nicene Creed written around 325 AD at the conclusion of the Council of Nicaea. From these creed and others like the Athanasius Creed in the same period came a uniform Christian doctrine. This was formulated by all the leaders in the church across Europe and North Africa to counter certain sects which argued against the existence of the Trinity and other basic tenets of the Christian faith.✞
Jesus himself defended his deity at his trial in John 10.36b when he said, "Why then do you accuse me of blasphemy because I said, 'I am God's Son'?" These passages like John 10.30, "I and the Father are one." clearly showed that Jesus was accused because he claimed to be part of the Deity and that he was God himself. Some modern and often very aggressive sects like Jehovah Witnesses and the Church of the Latter Day Saints (Mormons) deny the existence of Jesus in the Holy Trinity. They say that Jesus was not truly God, but that God only gave this chosen human being some special powers. They also contend that the Holy Spirit was merely a force from God and not God himself. They argue that the Father was another name for the One and only God.
From the earliest times, these views were called unorthodox and heresy by the church at large. Those who do not believe in the Trinity were considered sects and not legitimate denominations by the World Council of Churches which was founded in 1948. It's mission statement states that it was and is a "fellowship of churches which confess the Lord Jesus Christ as God and Savior according to the Scriptures and therefore seek to fulfill together their common calling to the glory of the one God: Father, Son and Holy Spirit." Belief in the Apostles' and Nicene Creeds were regarded as necessary for all churches and the true mark of genuine Christianity. That is why both the Mormons and Jehovah Witnesses and other similar sects were excluded from the World Council of Churches.✞