Although it can be interesting to focus on a single phrase or words, one must be careful in extrapolating meaning of a small isolated part of scripture, and it is good to examine the context and comparable or related bible scriptures.
Otherwise isolated excerpts from the bible such as:
- “…Whose God is their belly…” Philippians 3:19
- “…God presides in the great assembly; he renders judgment among the “gods”…” Psalm 82:1
- “… You are ‘gods’; you are all sons of the Most High.” Psalm 82:6
- “… It is written in your own Law that God said, ‘you are gods.’” John 10:34 (GNT)
- “See, I have made you like God to Pharaoh” (Exodus 7:1)
can easily cause misunderstandings. One interpretation may be that all those case god or gods refer to God Almighty, or some part of an N-inity, an alternative perspective is that often the words for "god" (‘elohiym and theos) can also just refer to those in a position of relative power. Or those to who other/people worship or give a power or honor. For example in the sense that God gave Moses power over Pharaoh, and that people worship their appetite as "a god".
In the case of Hebrews 1:8 the context shows also that:
10:2 Hath in these last days spoken unto us by his Son, whom he hath
appointed heir of all things, by whom also he made the worlds; 3 Who
being the brightness of his glory, and the express image of his
person, and upholding all things by the word of his power, when he had
by himself purged our sins, sat down on the right hand of the Majesty
on high; (Hebrews 1:2,3, KJV)
For to which of the angels did God ever say, “You are my Son; today I
have become your Father"? Or again, “I will be his Father, and he will
be my Son"? (Hebrews 1:5, NIV)
The whole point of Hebrews 1 is to point out The importance of the Jesus, that he is way more than just an angel. At the Same time, Jesus relation to God is described as “Son”, and the “image” or “representation” of Gods character, at the right hand of God Almighty. Angels worship Jesus (Hebrews 10:6) so in that sense Jesus is a god. But at the same time. Hebrews 10:9 shows that Jesus as a god is put in to that position by God Almighty.
You have loved righteousness and hated wickedness; therefore God, your
God, has set you above your companions by anointing you with the oil
of joy.” Hebrews 10:9
Some to force this "Unitarian" view in to a polytheistic view, by reasoning that if other gods are not part of a trinitarian or N-iterian God, those who hold that there can be other gods must thus believe in many gods and thus are polytheists. But the essence of this view is not the existence or belief in other gods, but the interpretation in the meaning of the word god referring to a position of relative power. God Almighty Yahweh, himself also uses the word "god" for others in the bible (e.g. in Psalm 82).