IMO it's actually less than that. I would take issue with anyone (and it's usually a non-believer who says it) who refers to the different "denominations" within orthodox Christianity as different religions, as if each group worships different gods.
Within "orthodoxy" (OCA/GCA/RCA friends, please note the lower case "o") we have the same beliefs regarding the nature of God, while there are some "Pentecostals" who don't. I'm pretty sure the "Pentecostal" Assemblies of God hold to orthodox Trinitarian theology. I'm familiar with one congregation that refers to itself as a "United Pentecostal Church" but which preaches modalism (the belief that the Father, Son, and Holy Spirit aren't distinct personalities within the one Godhead, but rather are different "modes" that God assumes in time, and IIRC only one at a time) regarding Jesus Christ's deity.
Yep...AG is trinitarian. UPC is "Jesus-only", and believes, IIRC, in "immediate dunkification" subsequent to confession of faith.