Actually they do believe in the Holy Spirit, they just believe He is God, a manifestion / power / emanation of the ONE true God.
Hmm again they do believe in the HS but to some they can be considered a cult because they do shun those who do not agree with everything they teach, you may not see this right away but you will if they don't indoctrinate you first.
Although I am Oneness I will never be a part of the upci because they teach that only their way is valid, and they are the only true church sounds familiar of course, but in all honesty I would advise you to not get your heart set on the upc church... [Staff edit] I have been to their church and I was told that I was not saved because I did get baptized in the name of The Father, The Son, and The Holy Ghost, I also speak in tongues etc and they said that was impossible because you can only truly be saved / receive the Holy Spirit if you get baptized in Jesus name only!
Many individuals call them Jesus only, well it's sort of true because they constantly harp on Acts baptism they do not accept Matthews baptism, but not all Oneness folk harp on that! I am Oneness and honestly I go by what Jesus said, He said that we should baptize in the name of The Father, The Son, and The Holy Spirit... the Apostles said Jesus because that is where they were given the Authority it was in Jesus' name, to each their own...
See I am not accepted in Trinitarian Churches I am deemed a heretic because the Trinity sounds fishy to me, something just don't seem right about it, yet I am shunned from joining a upci church because I do not agree that baptizing in Jesus name is the only true baptismal, I honestly think both Acts and Matthew are VALID. So please be wary joining any church that makes such claims that they are the only true church!
Also the reason why they all have long hair and dresses is because they adhere to a Holiness standard, I must admit I myself adhere to that same standard because it's biblical... so that part is not a cult necessarily, what makes them cult like is the way they shun anyone different... You will see what I mean if you keep going there.
Edit: Also they typically do NOT advocate watching TV!!! They do place rules and regulations on their members, the churches can vary a tad but typically the upc has a rule, and if a pastor tries to make the rules not so hard even they can lose their license and they can no longer preach...
The rules for joining a upc typically are;
Cannot cut the hair if you are a woman, men must be fully clean shaved (no beards), women must wear skirts usually to the feet but some do the knees and below, men must wear long sleeves some do allow short sleeves but this is rare, men must wear pants obviously LOL, umm usually no tv, members must be baptized in Jesus name only!, pretty much what the pastor and the upc as a whole says goes or you can be shunned and even rejected a membership. Oh and as proof for someones salvation they must all speak in tongues as a sign of truly receiving the Holy Spirit...
If you have any more questions please ask me!