What’s going on with Oneness Pentecostal's saying "Jesus is God," but "God is not the Son of God?"

Catholic and Protestant Churches have fallen away and abide not in the doctrine of Christ, and Oneness Pentecostal's put a stumblingblock or an occasion to fall in their brother's way. Did the Apostles preach, "God is not God the Son?" Ask a Oneness Pentecostal, "is JESUS GOD?" They will say "Yes." Ask them, "Is GOD the Son of God???" Silence. Scribes and Pharisees preached Jesus was not God's Son .. "he who denies the Son, the same has not the Father." And yes Jesus existed before his birth in Bethlehem. The LORD JESUS speaking in the flesh said he met Abraham as a man, John 8:58, and Jews wanted to stone him for saying it. Genesis 18, "the LORD (JESUS) appeared unto him in the plains of Mamre: and he sat in the tent door in the heat of the day;”
"the Son of Man having come indeed, will He find faith on the earth?" Do not boast over those branches. If you do, remember this: You do not support the root, but the root (the Deut 6:4 foundation) supports you. Pentecostal's are claiming two Divine Deities saying "Jesus is God, but God the Son is not scripture.” Are UPCI Oneness Pentecostal's preaching another Jesus by saying "God the Son of God is not Bible?” The Apostles didn't teach "God is not the Son of God." You can't establish doctrine from things-not-in-the Bible. Psalm 33:12 "God is the LORD," and JESUS CHRIST is LORD and GOD, and JESUS is God's Son.

If God is not the Son, then Oneness Pentecostal's are claiming God and the Son of God are "2-separate-Deities or persons." I'm not going to deny the faith of Jesus Christ over a grammatical point. "Father the God" is not scriptural wording, because of Grammar we say "God The Father." Will I therefore then say “God is not the Father” because the phrase "Father the God" is not in the Bible? This is a grammatical point they are making, not a Doctrinal point.
1 John 2:23 "Whoever denies the Son does not have the Father, but whoever confesses the Son has the Father as well."
1 Timothy 1:1 “God our Saviour, and Lord Jesus Christ” Not two separate Deities.

Prove all things; and hold fast that which is good, "Let every man be fully persuaded in his own mind.” By saying "God the Son is not Scripture," Oneness Pentecostals who are usually very biblically accurate are preaching "God is not the Son," because you can't have it both ways. You cannot say "it's scriptural, and not-scriptural" at the same time. Either God IS the Son of God, or God IS NOT the Son of God. In the beginning "GOD WAS THE WORD" (John 1:1 in Greek), and "GOD flesh became and dwelt among us" AS THE SON. I’m not going to deny my faith and say that God is not the LORD JESUS CHRIST, and I will not make the claim God and the Son of God are “separate deities," or separate persons.
... there are two statements being made by the UPCI, #1) "God the Son of God is not scripture," and #2) Pentecostal's falsely claim "Jesus did not exist before his conception." What?
God didn't send another person to die on the cross, God came himself. God is the Mediator of the New Testament. We will see JESUS on the throne. Revelation 4:2 “And immediately I was in the spirit: and, behold, a throne was set in heaven, and one sat on the throne.” Not God, and another person whose life began at the incarnation.

The Apostles never preached People need to deny that God is the Son of God:
The FATHER-The WORD flesh became (became the Son) and dwelled among us. The Son glorified (Spirit) is the Father. Glorified means Spirit.
Jesus is still the Son - In Revelation Jesus is the Son of Man and The Son of God. In Revelation 1:9-20 – The Son of Man: Christ Glorified, and Revelation 14:14. So does the Sonship end? No. The Son is the image of the invisible God.

Oneness Pentecostal's are usually 100% right on Doctrinal teaching, but they do deny Jesus Christ is eternal. Scriptures suggest otherwise;
Micah 5:2 "But thou, Bethlehem Ephratah, though thou be little among the thousands of Judah, yet out of thee shall he come forth unto me that is to be ruler in Israel; whose goings forth have been from of old, from everlasting."
Psalms 90:2
“Before the mountains were brought forth, or ever thou hadst formed the earth and the world, even from everlasting to everlasting, thou art God.”
John 1:15, 18, John 17:5 "the glory that he had with the Father before the world existed" .. John 17:24 "before the foundation of the world." Ephesians 1:3–5, 2 Corinthians 8:9, Galatians 4:4 and Colossians 1:15–17 where Paul wrote of the preexistence of Christ. Christians can disagree on some things, and that's all good, but there are other things in which we must needs be in agreement upon in order to be saved. Salvation is a gift for us by Jesus Christ who died on the cross for our sins and rose again for our justification.
Colossians 2:8-9
“Beware lest any man spoil you through philosophy and vain deceit, after the tradition of men, after the rudiments of the world, and not after Christ. For in him dwelleth all the fulness of the Godhead bodily."