"...Which is the first commandment of all? And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord.... And the scribe said unto him, Well, Master, thou hast said the truth: for there is one God; and there is none other but he:" (Mark 12:28-32)
Jesus, Himself, tells us that there is only one God! The great Apostle Paul tells us this same truth:
"But to us there is but one God, the Father, of whom are all things, and we in him; and one Lord Jesus Christ, by whom are all things, and we by him." (1 Corinthians 8:6)
"There is one body, and one Spirit, even as ye are called in one hope of your calling; One Lord, one faith, one baptism, One God and Father of all, who is above all, and through all, and in you all"
"For there is one God and one mediator between God and men, the man Christ Jesus;" (1 Timothy 2:5)
What is the Apostle Paul trying to reveal to us? First of all he states emphatically that there is one God—the Father. He goes on to tell us that everything that exists comes ultimately from this one God, the Father! This one God is the source of all life and power. He further states that there is one Lord, Jesus Christ, through whom He has done everything. This Jesus, is the link between Heaven and earth—our mediator. It is through Jesus that God and man are reunited.
Jesus also states this emphatic truth that there is only one God—the Father—and that eternal life is to know this God and Jesus whom He sent. In the famous prayer of John 17 we read:
"And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent." (John 17:3)
James says: "Thou believest that there is one God; thou doest well: the devils also believe, and tremble." (James 2:19)
Even the devils know there is only one God. The Scriptures plainly state that there is only one God. There is not a mention by any of the Bible writers that this God is made up of three different persons. The Trinitarian says there is "one God; Father, Son, and Holy Spirit." The Scriptures say there is one God, the Father.