oh and on checking some numbers, note that one can't say that Oneness Pentecostals are a small numbe r-- they are 10% of all pentecostals
And they emphatically do not believe in the Trinity
This is a major, fundamental dogmatic difference between orthodoxy and the Oneness P's -- now if an evangelical holds to a Trinitarian view, then the Oneness Pentecostal doctrine differs from theirs at a very fundamental level
That mischaracterizes what i said, which was that the OP churches and the SDA together make up less than 2% of all Christians. Oneness Pentecostals rep. 1.1% of all Christians, and 24 million out of 279 million pentecostal Christians and 305 million charismatic Christians, while Pentecostals overall (apart from Char. Christians) rep. 12.8% of all Christians. Pentecostal and charismatic Christians together make up about 27% of all Christians. (http://www.pewforum.org/Christian/Global-Christianity-exec.aspx; http://www.pewforum.org/Christian/Global-Christianity-movements-and-denominations.aspx)
Charismatics can include Catholics, and in which tongues are often prominent, while a 10-country survey by the Pew Forum on Religion and Public Life in 2006 found that 49 percent of Pentecostals in the United States, 50 percent in Brazil, 41 percent in South Africa, and 54 percent in India said they “never” speak or pray in tongues. (http://pewforum.org/uploadedfiles/Orphan_Migrated_Content/pentecostals-08.pdf)
This is relevant as OPs (wrongly ) require glossolalia for salvation.