The following bible scriptures clearly teach us that there is only One God:
James 2:19 Thou believest that there is one God; thou doest well: the devils also believe, and tremble.
Deuteronomy 6:4-5 Hear, O Israel: The LORD our God is one LORD: And thou shalt love the LORD thy God with all thine heart, and with all thy soul, and with all thy might.
Mark 12:29-32 And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord: And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment. And the second is like, namely this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these. 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:
Ephesians 4:6 One God and Father of all, who is above all, and through all, and in you all.
Deuteronomy 4:33-39 Did ever people hear the voice of God speaking out of the midst of the fire, as thou hast heard, and live? Or hath God assayed to go and take him a nation from the midst of another nation, by temptations, by signs, and by wonders, and by war, and by a mighty hand, and by a stretched out arm, and by great terrors, according to all that the LORD your God did for you in Egypt before your eyes? Unto thee it was shewed, that thou mightest know that the LORD he is God; there is none else beside him. Out of heaven he made thee to hear his voice, that he might instruct thee: and upon earth he shewed thee his great fire; and thou heardest his words out of the midst of the fire. And because he loved thy fathers, therefore he chose their seed after them, and brought thee out in his sight with his mighty power out of Egypt; To drive out nations from before thee greater and mightier than thou art, to bring thee in, to give thee their land for an inheritance, as it is this day. Know therefore this day, and consider it in thine heart, that the LORD he is God in heaven above, and upon the earth beneath: there is none else.
Deuteronomy 32:39 See now that I, even I, am he, and there is no god with me: I kill, and I make alive; I wound, and I heal: neither is there any that can deliver out of my hand.
Romans 3:30 Seeing it is one God, which shall justify the circumcision by faith, and uncircumcision through faith.
1 Samuel 2:1-2 And Hannah prayed, and said, My heart rejoiceth in the LORD, mine horn is exalted in the LORD: my mouth is enlarged over mine enemies; because I rejoice in thy salvation. There is none holy as the LORD: for there is none beside thee: neither is there any rock like our God.
2 Samuel 22:31-32 As for God, his way is perfect; the word of the LORD is tried: he is a buckler to all them that trust in him. For who is God, save the LORD? and who is a rock, save our God?
Isaiah 45:5-6 I am the LORD, and there is none else, there is no God beside me: I girded thee, though thou hast not known me: That they may know from the rising of the sun, and from the west, that there is none beside me. I am the LORD, and there is none else.
Isaiah 44:6-8 Thus saith the LORD the King of Israel, and his redeemer the LORD of hosts; I am the first, and I am the last; and beside me there is no God. And who, as I, shall call, and shall declare it, and set it in order for me, since I appointed the ancient people? and the things that are coming, and shall come, let them shew unto them. Fear ye not, neither be afraid: have not I told thee from that time, and have declared it? ye are even my witnesses. Is there a God beside me? yea, there is no God; I know not any.