Also a further blow to some of their statements. I have seen a lot of them pull out this section of revelations
Revelation 4
The Throne in Heaven
1After this I looked, and there before me was a door standing open in heaven. And the voice I had first heard speaking to me like a trumpet said, "Come up here, and I will show you what must take place after this." 2At once I was in the Spirit, and there before me was a throne in heaven with someone sitting on it. 3And the one who sat there had the appearance of jasper and carnelian. A rainbow, resembling an emerald, encircled the throne. 4Surrounding the throne were twenty-four other thrones, and seated on them were twenty-four elders. They were dressed in white and had crowns of gold on their heads. 5From the throne came flashes of lightning, rumblings and peals of thunder. Before the throne, seven lamps were blazing. These are the seven spirits[
a] of God. 6Also before the throne there was what looked like a sea of glass, clear as crystal. In the center, around the throne, were four living creatures, and they were covered with eyes, in front and in back. 7The first living creature was like a lion, the second was like an ox, the third had a face like a man, the fourth was like a flying eagle. 8Each of the four living creatures had six wings and was covered with eyes all around, even under his wings. Day and night they never stop saying: "Holy, holy, holy is the Lord God Almighty, who was, and is, and is to come." 9Whenever the living creatures give glory, honor and thanks to him who sits on the throne and who lives for ever and ever, 10the twenty-four elders fall down before him who sits on the throne, and worship him who lives for ever and ever. They lay their crowns before the throne and say:
11"You are worthy, our Lord and God,
to receive glory and honor and power,
for you created all things,
and by your will they were created
and have their being."
Saying well there is only one throne so god cant be three beings because where would they sit. WHat they fail to include is chapter 5
Revelation 5
The Scroll and the Lamb
1
Then I saw in the right hand of him who sat on the throne a scroll with writing on both sides and sealed with seven seals. 2And I saw a mighty angel proclaiming in a loud voice, "Who is worthy to break the seals and open the scroll?" 3But no one in heaven or on earth or under the earth could open the scroll or even look inside it. 4I wept and wept because no one was found who was worthy to open the scroll or look inside. 5Then one of the elders said to me, "Do not weep! See, the Lion of the tribe of Judah, the Root of David, has triumphed. He is able to open the scroll and its seven seals." 6Then I saw a Lamb, looking as if it had been slain, standing in the center of the throne, encircled by the four living creatures and the elders. He had seven horns and seven eyes, which are the seven spirits[a] of God sent out into all the earth. 7He came and took the scroll from the right hand of him who sat on the throne. 8And when he had taken it, the four living creatures and the twenty-four elders fell down before the Lamb. Each one had a harp and they were holding golden bowls full of incense, which are the prayers of the saints. 9And they sang a new song:
"You are worthy to take the scroll
and to open its seals,
because you were slain,
and with your blood you purchased men for God
from every tribe and language and people and nation.
10You have made them to be a kingdom and priests to serve our God,
and they will reign on the earth."
11Then I looked and heard the voice of many angels, numbering thousands upon thousands, and ten thousand times ten thousand. They encircled the throne and the living creatures and the elders. 12In a loud voice they sang:
"Worthy is the Lamb, who was slain,
to receive power and wealth and wisdom and strength
and honor and glory and praise!"
13Then I heard every creature in heaven and on earth and under the earth and on the sea, and all that is in them, singing:
"To him who sits on the throne and to the Lamb
be praise and honor and glory and power,
for ever and ever!" 14The four living creatures said, "Amen," and the elders fell down and worshiped.
Multiple times they reference multiple beings. Bolded for ease of location.
The best one is Revelation 5:6-7
6Then I saw a Lamb, looking as if it had been slain, standing in the center of the throne, encircled by the four living creatures and the elders. He had seven horns and seven eyes, which are the seven spirits[a] of God sent out into all the earth. 7He came and took the scroll from the right hand of him who sat on the throne.
The lamb that was slain comes and takes the scroll out of the hand of him who sat on the throne. That right there bascially proves the existence of the trinity.