ONE For All. One God
Eph. 4:6 One God and Father of all who is over all in all and through all.
ONE GOD
Deut.6:4 "Hear, O Israel! The Lord is our God, the Lord is one! 
Mark 12:29 Jesus answered, "The foremost is, 'Hear, O Israel ! The Lord our God is one Lord;
1 Cor. 8:6 yet for us there is but one God
One Creator. Our origin or existence
Genesis 1:1 In the beginning God created the heavens and the earth. 
Then God said, "Let Us make man in Our image, according to Our likeness; and let them rule over the fish of the sea and over the birds of the sky and over the cattle and over all the earth, and over every creeping thing that creeps on the earth." God created man in His own image, in the image of God He created him; male and female He created them. God blessed them; and God said to them, "Be fruitful and multiply, and fill the earth, and subdue it; and rule over the fish of the sea and over the birds of the sky and over every living thing that moves on the earth." (Genesis 1:26-28 NASB)
One Authority. Our reverence or role
James 2:19 You believe that God is one. You do well; the demons also believe, and shudder. 
Deuteronomy 6:13 You shall fear only the Lord your God; and you shall worship Him and swear by His name. 
One Judge. Our justice or salvation
Ephesians 2:4-5 But God, being rich in mercy, because of His great love with which He loved us, even when we were dead in our transgressions, made us alive together with Christ (by grace you have been saved)
Romans 5:8 But God demonstrates His own love toward us, in that while we were yet sinners, Christ died for us. 
John 1:9-10, 12-13 There was the true Light which, coming into the world, enlightens every man. He was in the world, and the world was made through Him, and the world did not know Him... But as many as received Him, to them He gave the right to become children of God, even to those who believe in His name, who were born, not of blood nor of the will of the flesh nor of the will of man, but of God.