'Oneness' folks do not believe that the second person of the Triune Godhead (Christ) stepped out of eternity and into time to take on a human form. For instance, they believe that at Jesus' baptism, He jumped up to heaven to say, "a voice from heaven said, "This is my Son, whom I love; with him I am well pleased.". Do you see how ridiculous that is? This is what Oneness folks believe. Not only that, a simple examination of scripture in it's original language (Genesis 1:26) states that God is plural.