John_4:24 God is a Spirit: and they that worship him must worship him in spirit and in truth.

God is one, the Scriptures say. God is a Spirit. That Spirit walked on earth in the man. That man was Jesus Christ, Emmanuel. The Spirit of God overshadowed Mary and because of this act, it is demonstrated that the Holy Ghost is the Father of Jesus Christ. The same Spirit that Jesus Christ would later say, I and my Father (the Holy Spirit of God) are one.
The Trinity is a Catholic doctrine, not a Biblical one. It was the Catholic Church that added to scripture in 2John 5:7, Father, Word and Spirit, these three are one. This text was added by the Catholic Church, during a meeting call the council of Nicaea. This council also changed the formula that the Apostle Peter first delivered to the saints of the church of the Living God from “Baptism in the Name of Jesus Christ, to Baptism in the name of the Father, Son and Holy Ghost, to be said, not as a name, like the name, but as three titles of a triune Godhead. In this, many people were confused into believing that God no longer is simply the All knowing, All powerful, Almighty, everlasting SPIRIT and not three persons in a Godhead. The worship of a Trinity was the former pattern or worship for the Roman Pagans of that time. The scripture itself says that the Godhead is in Jesus. In saying this, there is only one person in the Godhead, and that is Emmanuel, God with us. The name of Emmanuel of course is Jesus Christ.
It was not the Council of Nicaea that Jesus gave the keys to the Kingdom, it was to Peter, not the Catholic Church, but his plan was authorized among His apostles to share with the whole world. Whose report are you going to believe?
Here are some documents that show that the Catholic Church also changed the baptism formula, evidence can be found in their Encyclopedia.

Also BRITANICA ENCYCLOPEDIA
The baptismal formula was changed from the name of Jesus Christ to the words Father, Son & Holy Ghost by the Catholic Church in the Second Century. – 11th Edit., Vol. 3, pg. 365-366.

CANNEY ENCYCLOPEDIA OF RELIGION
The early church always baptized in the name of the Lord Jesus until development of the Trinity Doctrine in the Second Century.
CATHOLIC ENCYCLOPEDIA
Here the Catholics acknowledged that baptism was changed by the Catholic Church. – Vol. 2, pg. 263.
HASTINGS ENCYCLOPEDIA OF RELIGION
Christian baptism was administered using the words, “in the name of Jesus.” – Vol. 2, pg. 377. Baptism was always in the name of Lord Jesus until time of Justin Martyr when Triune formula used. – Vol. 2, pg. 389. NAME was an ancient synonym for “person.” Payment was always made in the name of some person referring to ownership. Therefore one being baptized in Jesus’ name became His personal property. “Ye are Christ’s.” – Vol. 2, pg. 377 on Acts 2:38.
I was asked the question;” Which one is Jesus?
Jesus is Emmanuel. This name means that the flesh and blood man walked on this earth as God, or Elohim with us. Not a which. He is body, soul and Spirit of God. He is God that became flesh. In heaven there is only one God. God was not multiplied because Jesus came. Believest thou not that I am in the Father, and the Father in Me? the words that I speak I speak not of Myself: but the Father abiding in Me doeth the work.’ — John 14:10
There is only one God, in Isaiah, it is said, there is no other. JUST AS YOU ARE BODY SOUL AND SPIRIT. When Jesus walked this earth, He was body, soul, and spirit of God. There is no more trinity than that. Again, Jesus who is Emmanuel (God with us) is body, soul and Spirit of God. This is the afore image that man were made into when God made Adam into his own image.
An Insight from a Jew: Sid Roth’s of Its Supernatural

The Jewish prophet Isaiah predicted over 800 years before Jesus came to earth that God would become our salvation in Isaiah 12:2. The Hebrew word for salvation is Yeshua! The Hebrew in this verse means that God Himself would become our salvation, our deliverance, our defense, our help, our preservation, our freedom and our victory.
Isaiah 12:2 “Behold, God is my salvation (Yeshua)
I will trust and not be afraid; ‘For Yah, the Lord, is my strength and song; He also has become my salvation (Yeshua).”