You don't read the logos into CHRIST
No. I don't read Christ into the logos.
and you believe CHRIST became the logos when and after GOD brought HIM Forth?
Correct.
Why does the WORD of GOD say the Testimony of JESUS is the SPIRIT Of PROPHECY
The same Spirit that led the prophets to prophesy of Messiah has led Yeshua to prophesy about the things written in Revelation.
And how does the WORD of GOD say THE SPIRIT of CHRIST was in the prophets testifying prophesying of the sufferings and the grace and glory which would come?
YHWH always gives His spirit, and then it is named as it functions. When it is associated with wisdom, it is called the “spirit of wisdom” (Exodus 28:3). When it is associated with grace, it is called the “spirit of grace” (Hebrews 10:29). When it is related to glory, it is called the “spirit of glory” (1 Peter 4:14). It is called the “spirit of adoption” when it is associated with becoming one of YHWH's children (Romans 8:15). It is called “the spirit of truth” when it is associated with the truth we learn by revelation (John 14:17). When it came with the same power as it brought to Elijah, it was called “the spirit of Elijah” (2 Kings 2:15). These are all one and the same Spirit that function differently.
When Peter mentions that “the spirit of Christ” was upon prophets as they “predicted the sufferings of Christ and the glory that would follow,” it is easy to see that the spirit is called the “spirit of Christ” because it is associated with Christ and foretold of Christ, not because Christ was actually alive during the Old Testament.
What did CHRIST mean when HE said HE came down from Heaven
Or I came forth from GOD and into the world again I leave the world and go back to THE FATHER?
The phrase "came down from heaven" is difficult for many to understand. The Jews did not understand either as we read in John 6:42; "And they said, Is not this Yeshua, the son of Joseph, whose father and mother we know? How is it then that he saith, I came down from heaven?" There is no doubt that Yeshua was emphasizing his heavenly and paternal origin, but in what sense was he declaring this?
Was Yeshua a preexistent spirit being living side by side with YHWH that was transformed into an embryo placed in Mary's womb or was he actually "inside" YHWH? John 17:8 teaches the latter. It reads, "For I have given unto them the words which thou gavest me; and they have received them, and have known surely that I came out from thee , and they have believed that thou didst send me." The Greek word "exerchomai" translated "came out" specifically means to go out of something that you were inside of. In this case, Yeshua existed "inside" of his Father in a similar sense that Levi existed inside the "loins of his father" before he was born (Hebrews 7:5-10). In that passage, Levi was not born yet, nor was his father Jacob. Yet, Levi was said to be in Abraham's loins (in the sense of future lineage). (The lineage of Messiah is spoken of in Micah 5:2 and it traces all the way back to his Father Yahweh). While it is difficult to perceive of the Almighty having an "inside," that is what the text is saying. Yet, this, too, is figurative and equates with the mind of YHWH.
There will be those who will totally misunderstand my words, so let me clarify this. I am not suggesting the Almighty has "loins." Nor am I suggesting Yeshua was conceived in any manner similar to the manner in which all men are conceived (through procreation/copulation). YHWH is Spirit. His Holy Spirit "came upon" Mary and miraculously caused her egg to receive the necessary DNA to create a 100% male child in her womb.
Luke 1:35 says, "And the angel answered and said unto her, The Holy Spirit shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God."
Yeshua declared this truth in John 16:27-30 as well. "For the Father himself loveth you, because ye have loved me, and have believed that I came out from God. I came forth from the Father, and am come into the world: again, I leave the world, and go to the Father. His disciples said unto him, Lo, now speakest thou plainly, and speakest no proverb. Now are we sure that thou knowest all things, and needest not that any man should ask thee: by this we believe that thou camest forth from God." Yeshua could not come from YHWH's side and from inside of YHWH at the same time. Only one can be true.
A verse that goes hand in hand with the phrase "came down from heaven" is John 6:62; "What and if ye shall see the Son of man ascend up where he was before?" Yeshua's origin is not in question here. Yeshua was, at one time, in heaven. He existed in the loins of His Father YHWH (in the sense of future lineage) until the appointed time of his earthly birth.