although certain Unitarians agree with the part of Enoch not believing Jesus was the SUPREME GOD, it seems they reject the book of Enoch because they believe Jesus did not exist before being born by Mary, and was not a real physical person, but was just a plan in GODS mind.
It is believed the Lord of Spirits is God in 1 Enoch.
1 In that place I beheld a fountain of righteousness, which never failed, encircled by many springs of wisdom. Of these all the thirsty drank, and were filled with wisdom, having their habitation with the righteous, the elect, and the holy.
2 In that hour was this Son of man invoked before the Lord of spirits, and his name in the presence of the Ancient of days.
3 Before the sun and the signs were created, before the stars of heaven were formed, his name was invoked in the presence of the Lord of spirits. A support shall he be for the righteous and the holy to lean upon, without falling; and he shall be the light of nations.
4 He shall be the hope of those whose hearts are troubled. All, who dwell on earth, shall fall down and worship before him; shall bless and glorify him, and sing praises to the name of the Lord of spirits.
5 Therefore the Elect and the Concealed One existed in his presence, before the world was created, and for ever.
6 In his presence he existed, and has revealed to the saints and to the righteous the wisdom of the Lord of spirits; for he has preserved the lot of the righteous, because they have hated and rejected this world of iniquity, and have detested all its works and ways, in the name of the Lord of spirits. http://reluctant-messenger.com/1enoch01-60.htm#Chapter48