The attraction of Oneness Pentecostalism is probably that it does not require any belief in divine persons except Jesus the human being. If you do not believe in ghosts and find it scary to think any spirits might exist, then oneness is ideal. You just have Jesus, a nice friendly person to think about. Nothing scary. Just atheism and a man named Jesus. It is really how it would be if an atheist had met Jesus and misunderstood Jesus’ teachings and never realised the Father he spoke of is actually an extremely powerful spirit being. If you did listen to him like this, you could just assume Jesus was speaking about himself all the time in an odd “modal” kind of way, and assume there were no gods or ghosts or any invisible supernatural beings to worry about. You just listen to Jesus and dismiss all suggestion of supernatural beings as just symbolism in how he spoke. Perfect for people who cannot believe in gods, ghosts or anything hidden and supernatural. Divinity becomes about modes, not divine beings. No God being. No ghosts. No spirit beings.