Okay you do not know of any but let me share with you something and you tell me how they possibly believe he is only one when they word it the way they do.
this is taken from the following website
http://www.believersweb.org/view.cfm?ID=693
THREE GODS OR ONE?
We teach there is one God manifest in three persons:
God the Father, God the Son, and God the Holy Ghost. The Jesus Only people teach that Christ is the Father, He is the Son and He is the Holy Ghost. Hence the name, Jesus Only. I believe we can provide proper evidence from the Word of God that this is not the case and that the teaching advanced by these people is erroneous and does not accord proper due and honor to the Godhead.
The Scripture does state there is one God. But the word "one" relates to unity as well as number.
I John 5:7 clearly means
one in unity, as does St.
John 17:11-21. And yet
there are three distinct persons:
the Father, the Son, and the Holy Ghost.
The three are spoken of as one in number and yet treated individually in Scripture. There is one God the Father, one Lord Jesus Christ, and one Holy Ghost (
I Corinthians 8:6; Ehpesians 4:3-6).
Thus there are three separate persons in divine individuality and divine plurality. The Father is called God (
I Corinthians 8:6), the Son is called God (
Isaiah 9:6-7;
Hebrews 1:8;
John 1:1-2) and the Holy Spirit is called God (
Acts 5:3- 4). Individually, each is called God; collectively, they can be spoken of as one God because of their perfect unity. The word "God" can be used either in the singular or in the plural, like sheep. Everything that could pertain to God collectively could also apply equally to each member of the Godhead as individuals. However, there are some particulars which relate to each individual person of the deity as to position, office, and work that could not be attributed to either of the other members of the Godhead. For instance, the Father is the head of Christ (
I Corinthians 11:3). The Son is the only begotten of the Father (
II John 1:3). The Holy Ghost proceeds from both the Father and the Son (
John 14:16;
Acts 2:3-4).
With words like that, and this is how most all trinitarians discribe the ONE GOD they serve, how can we possibly understand that they believe in ONE GOD? They even state that the Godhead is a mystery. The Bible does not ever call the Godhead a mystery. It says great is the mystery of Godliness and it also says that the fullness of the GODHEAD dwelled in him (Jesus) bodily.
You can say all day that they do not believe in three but their words betray them. If they believed in one God they would believe that Peter was teaching the truth at Penetcost and would actually baptize the way they were instructed, in Jesus name. They obviously believe that Jesus is just one of three that exist and agree eternally as one. That is still three.