Oneness Pentecostals deny the Trinity (likewise Branhamites) and teach that Jesus Christ is the Father, the Son and the Holy Spirit.
They believe that ‘Father’ refers to God in family relationship to man; ‘Son’ refers to God incarnate; and ‘Holy Spirit’ refers to God in activity. For example, one man can have different significant relationships or functions – such as administrator, father, teacher, and counsellor – and yet be one person in every sense of the word.

–After Jesus was baptized, A VOICE came from heaven, saying: “This is my beloved Son” Matt3:17
Who spoke those words? That voice was the voice of the Father of our Lord Jesus Christ; for that voice called Jesus ‘My beloved Son”
Branhamites believe that God came upon the man Jesus at baptism and left him while on the cross when Jesus cried, ”My God, My God, why have you forsaken Me?” Mat.27:46. In fact the Father turned his back to Jesus on the cross because Jesus as a human was bearing our sins. As for Jesus calling the Father, ”My God”, He does it again in Rev3:5,12,21
— “… behold, the heavens were opened to Him, and He saw the Spirit of God descending like a dove and alighting upon Him” Matt3:16
The Scripture teaches that it was God the Father who anointed His Son with the Holy Spirit: “…therefore, God, Your God has anointed You with the oil of gladness more than Your companions” (Ps.45:7). How many Gods exist then? God the Son was anointed by God the Father. However, they are not two Gods but 2 persons, one God, because Jesus said: “I and My Father are one” Jn10:30 Therefore, Jesus was not the Father but one with the Father.
— “This is MY BELOVED SON, in whom I am well pleased. Hear Him!” Matt17:5
Surely it was not Jesus but God His Father who spoke. This is confirmed by Peter in 2Pet.1:17-18.
— “Not everyone who says to me, ‘Lord, Lord’ shall enter the kingdom of heaven, but he who does the WILL OF MY FATHER [WHO IS] IN HEAVEN” Matt7:21; Matt12:50
–If the term ”Father” was just a title applied to Jesus how is it that Jesus thanked the Father? “I THANK YOU FATHER, LORD OF HEAVEN AND EARTH, that You have hidden these things from the wise…” Matt11:25-26, “FATHER, I THANK YOU that You have heard me” Jn11:41. To whom has Jesus prayed so often? See also Matt11:25, 26:39&42,  Mk14:36, Lk10:21, 22:42, 23:34, 23:46, Jn.11:41, 12:28
–Jn14:23 Jesus said to His disciples: “If anyone loves Me, he will keep My word; AND MY FATHER WILL LOVE HIM, AND WE WILL COME TO HIM and make Our home with him”. Note that Jesus, referring to Himself and to His Father, said “WE … OUR…’. Jesus was not the Father.
–Phil.2:6-11: “Jesus being in the form of God, did not consider it robbery TO BE EQUAL WITH GOD, but made Himself of no reputation…..Therefore GOD ALSO HAS HIGHLY EXALTED HIM ….that every tongue should confess that JESUS CHRIST IS LORD, TO THE GLORY OF GOD THE FATHER”. Here it is clear again that Jesus is not the Father.
–“He was received up into heaven, and sat down AT THE RIGHT HAND OF GOD”; also Mark16:19,  Acts2:33, 7:55&56,  Rom8:34,  Col3:1,  Heb10:12,  1Pet3:22
And do you know what Jesus is doing there? He “MAKES INTERCESSION FOR US” Rom8:34, a mediator between God the Father and us, since “a mediator does not mediate for one only” Gal3:20, there must be someone to whom He prays on our behalf, and this someone is God the Father. This is why we pray to God the Father in the name of Jesus Christ, because Jesus Christ is the God-man Mediator between God the Father and us 1Tim2:5
–Jn20:17 Jesus said to Mary, ”Do not touch Me for I have not yet ascended TO MY FATHER….MY FATHER AND YOUR FATHER, MY GOD AND YOUR GOD” (then v27 few days later Jesus asks Thomas to touch him); then v21: ”as THE FATHER SENT ME, so send you I” and v21: ”take Holy Spirit”, here we see that Jesus is not the Father and is not the Holy Spirit
–Is9:6 says that Jesus’ name is ”everlasting Father”, this should rather be translated ”Father of eternities” implying that He is Creator and sustainer of all things and one without beginning and end, see also Col1:17, Rev1:8,11,17,18
Heb2:11 says that Jesus calls us His brothers, not sons. We dont call Jesus ”Father”;
–Rom8:17 says we are joint-heirs with Christ, heirs of God
Other verses in which Jesus and the Father are both mentioned: Jn8:16-18,10:17,14:28,31,15:9,16:32; 1Jn1:3,4:15;1Cor15:24-27;Rev5:1-7;Dan7:13-14;Gen1:26-27,11:7;Is48:16;
In 33 verses in the New Testament, Jesus spoke of the Father as having “Sent” him!
You Cannot be sent without a SENDER!  One who SENDS and the one who IS SENT are separate entities: Matt10:40,Mk9:37, Lk4:18,9:48,10:16, Jn4:34,5:24,30,36;6:38,44,57;7:16,28,33; 8:16,18,26,29,42; 9:4, 11:42, 12:44,49; 13:20, 14:24, 15:21, 16:5, 17:18,21,23,25; 20:21

Sabellius is the first one to propose this theory of ”Jesus only” in the third century (Oneness Pentecostals revived it some 80 years ago). Few years later Arius took his doctrine further to say that Jesus was created (Jehovah Witnesses revived this doctrine 150 years ago), both teachings were condemned at the church council in Nicea in 325A.D.

–…”And I will ask the Father, and he will give you ANOTHER COUNSELOR to be with you forever – the Spirit of truth. The world cannot accept him, because it neither sees him nor knows him” Jn14:15-17. ‘Another’ means ‘not the same’. The world can’t receive the Holy Spirit, but they can receive Jesus Jn1:12 and if they do, then the Holy Spirit comes automatically inside them Acts10:44,11:15; Rom8:9, 1Cor3:16, 6:19.
–Jn16:7-15: “if I go not away, the COMFORTER WILL NOT COME unto you….I WILL SEND HIM unto you….HE WILL REPROVE the world of sin…. I GO TO MY FATHER…HE, THE SPIRIT OF TRUTH….HE WILL GUIDE YOU into all truth: for HE SHALL NOT SPEAK OF HIMSELF; but whatsoever he shall hear, that shall he speak: and HE will shew you things to come. HE SHALL GLORIFY ME…”
–“And whosoever speaketh a word against the Son of man, it shall be forgiven him: but whosoever speaketh AGAINST THE HOLY SPIRIT, it shall not be forgiven him, neither in this world, neither in the world to come” Matt12:32. As you can see, those who speak against the Son of man can be forgiven, while those who speak against the Holy Spirit shall not be forgiven. Therefore, Jesus can’t be the Holy Spirit
–The sin against the Holy Spirit is to reject the testimony of the Holy Spirit about Jesus being the only way of salvation

Oneness Pentecostals (also Brahnamites, stating that Jesus was a human only) deny the existence of the Son of God prior to the incarnation as Son (so they deny the Trinity). They say: “Jesus pre-existed the Incarnation, not as the eternal Son but as the eternal Spirit of God and at the same time Father”. According to them, Jesus could not exist as Son because ‘the Son had a beginning, namely, at the Incarnation’ and thus ‘the term Son always has reference to the Incarnation, to the humanity in which God dwelt and revealed Himself’
However, the Scripture teaches that the Son of God, before the incarnation, existed as a Person separate from God the Father:
–John said: “We have seen his glory, the glory of the one and only Son, the Only Begotten of the Father, full of grace and truth” Jn1:14. Isaiah saw Jesus: Jn12:41
–Jesus said: “Most assuredly, I say to you, before Abraham was I AM” Jn8:58
–Jn6:62 “What then if you should see the Son of Man ascend WHERE HE WAS BEFORE?”
–Jn6:38 “For I HAVE COME DOWN from heaven, not to do My own will, but THE WILL OF HIM WHO SENT ME”
–Jn17:5 “And now, O FATHER, GLORIFY ME together with Yourself, with the glory which I had with You BEFORE THE WORLD WAS”
–Phil2:5-7; Jesus Christ, as Son existed even before His arrival into this world; He was with the Father, He was in the form of God, that is to say, He was equal with God. Therefore, He pre-existed as a Person, for the Scripture says that He was sent by the Father, He was given by the Father, and Jesus Himself clearly said that He came down from heaven.
–Jn1.1-3,14 John says that the WORD WAS WITH GOD, and then that the WORD WAS GOD; however, when John says that the Word was God he does not mean that the Word was God the Father.
Notice also the following thing: John says that all things were made through the Word, that is to say, through the Son; “All things were created through Him and for Him” Col1:16; God “made the worlds” (Heb1:2) through His Son. Since God created the heavens and the earth through His Son, this means that the Son of God was in heaven with the Father before the world was made.
–See our detailed study, ”JESUS IS THE ANGEL OF THE LORD”, who in the Old Testament has appeared to men and was called God and has accepted worship.

False doctrine about the Godhead has affected the teaching about salvation, for, since according to them the Holy Spirit is Christ in Spirit rather than in flesh, ‘to receive Christ is to receive the Holy Spirit’, thus they see the baptism with the Holy Spirit as a replacement of receiving Christ. In other words, for them if a believer is not baptized with the Holy Spirit by their laying of hands followed by speaking in tongues and even baptized with water in the name of Jesus only, he is not saved yet, also if they accept the laying of hands then they have received Jesus also.
They deny the Biblical Jesus Gal1:6, 1Cor11:4. We should reject this heresy.
P Daniel