“What.....?Pentecostals? That’s news to the Pentecostal in me?”
Oneness Pentecostals. They don’t believe in the Trinity.
https://en.wikipedia.org/wiki/Oneness_Pentecostalism
The issue is that the term “trinity” is the best of the “worst” short hand terms we have to use in describing a wonderful but mysterious relationship between Father, Son and Holy Ghost. All are God and God is one! Yet they are also 3 in one. I simply accept what the scripture says...”in the name of the Father, the Son and the Holy Ghost”! While the term “trinity” is not in the Bible, the reality of it IS in the Bible! I accept what the Bible says about it!
I've spend dozens of hours debating one of them. To him I am not even a Christian because I've not been baptized in the name of Jesus and I haven't spoken in tongues. He also believed if he left his denomination he'd loose his salvation.