I said this in another thread but thought I thought I should repost it in this one!
I just read David Reed's book "In Jesus Name". In his book he kind of said something like this.
Oneness Pentecostals were thrown out of Christianity because of our views on the Trinity and Salvation. I don't remember the word he used Cult Heresy or what.
But as time goes by and we explain our believes in a more theological manner and people get to know us, we will be eventually accepted into mainstream. David Reed is much more eloquent in explaining this but you get the point.
Something else that he mentioned is that Pentecostal Assemblies of the World are a little more accepted than the UPCI. He attributes this to the PAW holding on to GT Haywood's teaching of the light doctrine. This explains that the PAW accepts other Christians and that God has a place for them even if they have not come into the full truth of salvation.
It seems David Reed has a lot of opinions for an Ex-Oneness Pentecostal!