The baptism of the Holy Spirit proceeds water baptism! This is different from the AOG.
I used to call the AOG, "Charismatic Baptists"
. I guess this is similar to you calling them, "Charismatic Evangelicals."
Beside their Oneness theology, what other differences make the UPC, "a completely different animal?"
The disciplines they must follow:
Men can't have beards and must have short hair. No wearing shorts in public, and many still require long sleeve shirts as well.
Women are not suppose to cut their hair. Must wear dresses or skirts, no pants.
No TV. Not sure what they did about the internet since I left by then; I'm assuming some of it is allowed.
Outside of their belief in modalism, their baptism uses the Jesus' Name formula, and not the Trinitarian one. They are not "Sola Fide" believers; and they are not "Once Saved Always Saved" believers either.
One is saved by the indwelling of the Holy Spirit, whose evidence given is speaking in Tongues. If you do not have the gift of tongues, that means you don't have the Holy Spirit.
You can loose salvation, which they refer to as "back-sliding"; and if you back-slide, ie. leave church; then you pretty much are ostracized from the community. Lost some, what I viewed originally, good friends when I converted to Catholicism.
Worship is fairly unorganized. Mostly singing and preaching. The belief is that the Spirit will take the congregation where He wants it to go. There have been services, especially during a revival, that I attended, were all we did was sing for three hours, but mostly start out with singing, then preaching, then altar call.
They are also big on the rapture.