I have some time right now so I thought I might as well state my position:
Proof that only Father and Son are God can be discerned solely by reading carefully the Book of Revelation.
From Revelation 4:5 we have “…and before the throne were burning seven torches of fire which are the seven spirits of God.” From Revelation 5:6 we have “…I saw a Lamb standing, as though it had been slain, with seven horns and seven eyes, which are the seven spirits of God sent out into all the earth”. Therefore, the Holy Spirit is an operation and ingredient of The Father and Son.
Further proof is needed? Look to whom the twenty-four elders bow down to. They only bow down before God and the Lamb. From Revelation 4:10 regarding the Father “The twenty four elders fall down before him who is seated on the throne and worship him who lives forever and ever”. From Revelation 5:8 regarding the Son “…the twenty four elders fell down before the lamb, each holding a harp…”. Also from Revelation 5:13 “And I heard every creature in heaven and on earth and under the earth and in the sea saying “To him who sits on the Throne and to the Lamb be blessing and honor and glory and might forever.” Again only Father and Son are praised, I do not see the Holy Spirit being praised individually”.
More proof is needed? Let’s continue. In Revelation 6:16-17 we have “Fall on us and hide from the face of him who is seated on the throne and from the wrath of the Lamb. For the great day of their wrath has come, and who can stand?”
From Revelation 12:17 “…went of to make war on the rest of her offspring, on those who keep the commandments of God and hold to the testimony of Jesus.” Repentance is towards God the Father for having a carnal nature contrary to God’s spiritual nature and faith is on the intercession of Jesus Christ for us when after the resurrection we shall become sons of God for from Revelation 21:7 “The one who conquers will have this heritage, and I will be his God and he will be my son.”
Shall I continue? From Revelation 14:12 “Here is a call for the endurance of the saints, those who keep the commandments of God and their faith in Jesus.” From Revelation 22:1 “Then the angel showed me the river of water of life, bright as crystal, flowing from the throne of God and of the Lamb.” Again only Father and Son have thrones.