DISCLAIMER: Of course, I could be thoroughly and completely wrong about the driver’s intentions. But from where I sit, this is the most reasonable explanation.
My guess is that it’s actually not just Pentecostal, but Apostolic or “Oneness Pentecostals”. They do not believe in the Trinity, but a single God who can be in different forms. They say that one God’s name is Jesus, and believe in baptizing in the name of Jesus only, instead of other verses that say to baptize “in the name of the Father, the Son, and the Holy Spirit.”
It’s a big Scripture for those folks. The logic is that, since it says both things, the two statements must be equal. And thus Jesus is “the Father, the Son, and the Holy Spirit.” Not only “the Son.”
That said, they do tend to believe in the Pentecostal tradition of Speaking in Tongues and such, so the other part is probably right, too.
In fact, I have direct experience with these folks, but I’m not sure it fits in here to talk about it. I got a crash course when they tried (and thought they succeeded) in converting me. I will say this much–it involved fast talking and assuming my trying to understand what they were saying was me agreeing with them. And, of course, a baptism “in the name of Jesus,” since I’d previously only been baptized with the traditional Trinitarian formula.