To name just a few: Seventh Day Adventists, Church of God, Unification Church, Pentecostals, Unitarian Universalists Christian Fellowship, etc.
Wow! You don't know what you are talking about!
From the Seventh Day Adventist's official website:
2. Trinity:
There is one God: Father, Son, and Holy Spirit, a unity of three co-eternal Persons. God is immortal, all-powerful, all-knowing, above all, and ever present. He is infinite and beyond human comprehension, yet known through His self-revelation. He is forever worthy of worship, adoration, and service by the whole creation. (Deut. 6:4; Matt. 28:19; 2 Cor. 13:14; Eph. 4:4-6; 1 Peter 1:2; 1 Tim. 1:17; Rev. 14:7.)
From the official Church of God offices website:
In one God eternally existing in three persons; namely, the Father, Son, and Holy Ghost.
The United Pentecostal Church IS Anti-Trinitarian - but is considered a cult. It is not the Pentecostal church.
The Unification Church isn't even Christian.
Unitarian Universalists are also a cult.
Christian Fellowship isn't even a denomination.
Pentecostals and the Church of God are not non-trinitarian.
You might specify some group that has deviated from these into non-trinitarian areas.
There is such a thing a "Jesus-Only" pentecostals (United Pentecostal, perhaps) who are non-trinitarian.
Both of the major Churches of God are trinitarian: Anderson and Cleveland. (Herbert Armstrong's group 'The Worldwide Church of God' was non-trinitarian.)
Specificity helps.