The Realm Of God
This is to ask who occupy the realm of God and has the title of God? In the realm of God, there is only one title of God and only one Supreme being that has the title of God. It is different from the realms of the Angels, Satan, demons, mankind and others, where there are different ranks and titles for the beings in the same realm. There is only one realm of God and there is only one title of God. This is what it means that God is one.
For instance, in the realm of the Angels, we have the Cherubim, the Seraphim, the arch-angels and the other Angels. They have their respective individual names and group ranks, but all are called Angel which is their realm title.
There is the realm of Satan (also called the devil) where we have someone like Lucifer their chief and others who has their individual names as well, but they are all called Satan or devil which is their realm title. Anyone of them in this realm can be called Satan or devil because this is their title.
There is another realm called the realm of spiritual forces which comprised of spirit beings that has different group ranks. Then comes the realm of human beings which comprised of people with physical bodies operating individually as persons and collectively as mankind with lot of external diversities and two different genders. Though we have different titles according to our gender, positions and qualifications but we are all one specie called human beings or mankind.
The Spirit Beings of these other realms are not visible to us because they do not have physical bodies like us, but that does not make them Omni-presence like God. An individual being of that realm cannot be everywhere at the same time. 
For instance, if five different persons who are in five different locations at a given time happen to see Satan, they will individually be seeing five different Satan. They cannot see the same Satan in their different locations at the same time. All the five Satan will not be the same, they are individually different from one another. The same thing is applicable to Angels, the spiritual forces and human beings. They differ from one another and do not have the ability to appear in different locations at the same time. With God it is different because God is Omni-presence. When five people in five different locations see God at the same time, they will be seeing the same God and not five different individual God. God is one, Satan is not one neither are the Angels nor human beings. (Matt 12:25-26).
The realm of God is one, the title of God is one and there is only One Supreme Being who is God. Those who have the Bible and the Torah can understand this from the story of Joseph and Pharaoh of Egypt.
“And Pharaoh said to his servants, “Can we find such a one as this, a man in whom is the Spirit of God?” Then Pharaoh said to Joseph, “Inasmuch as God has shown you all this, there is no one as discerning and wise as you. You shall be over my house, and all my people shall be ruled according to your word; only in regard to the throne will I be greater than you.” And Pharaoh said to Joseph, “See, I have set you over all the land of Egypt.” Genesis 41:38-41.
You see the way Pharaoh made a distinction between the throne and the ruling authority he gave to Joseph. This is how it is with the title of God. Anyone can be exalted to the place of highest authority, but in regard to the throne, there will be only one God. Every other person must be under Him because in the realm of God there is only one throne and only the one who is God sits on it. Despite the fact that Pharaoh gave Joseph authority saying that his house and all his people shall be ruled according to Joseph’s word, yet he said Joseph cannot become another Pharaoh and cannot be addressed as Pharaoh.
There shall always be only one Pharaoh in the land of Egypt. Truth about the rank and the title ‘God’ is clearly hidden in this message. No one should still be confused about the understanding which God communicated to us in this message.
The scripture says in Philippians 2:8 that God exulted Jesus to the highest place and gave him the name that is above every name. God did not declare Jesus His equal. God declared that He has today begotten Jesus as His Son. He declared Himself the Father of Jesus. It was for His own glory that God gave Jesus the name that is above every name. The name was given to Jesus by God for the glory of God Himself. Like Joseph, Jesus was exulted to the highest place by God, but the throne and the title of God remained that of the Father.