Proposition # 15: Jesus is called God at Hebrews 1:8 where it reads, “But of the Son He says, ‘Your throne, O God, is for ever and ever.’”
Response: Hebrews 1:8 is quoting Psalm 45:6. [1] Concerning this Psalm F.F. Bruce writes in his commentary:
It is impossible, however, to identify the king for whom this particular song was originally composed — probably by a court poet or prophet … ‘Your throne, O God’ is supported by the ancient versions (cf. Heb. 1:8). Although the Israelite king was not regarded as divine (as the kings of Egypt were), it is possible that he would be addressed as ‘God’ either in a form of Oriental hyperbolic language or as a representative of God (cf. Exod. 21:6; 22:8, 9, 28; Ps. 82:6).
Likewise in Hebrews 1:8, Jesus is being called God in a representative sense.
[1] Some modern English Bibles give an alternate reading to these verses in their footnotes: “Your throne is God for ever and ever.” [Prop # 15]