God the Father didn’t save the good souls from the Old Testament?
God the Holy Spirit won’t help save the good souls in the future?
You argument doesn’t include these, does it?
God the Father communicated the way of Salvation to our first parents, Adam and Eve:
Genesis 3:15 And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.
The Redeemer would be needed to save us.
And God the Father communicated that the price would require a blood sacrifice:
Genesis 3:21 Unto Adam also and to his wife did the LORD God make coats of skins, and clothed them.
Adam and Eve's coverings by the works of their own hands would not do. God would provide the required covering, and it would cost blood.
The "good souls" in the Old Testament were saved through the method ordained by God the Father - through the Redeeming work of God the Son. The "good souls" in the Old Testament knew this, for the Old Testament scriptures pointed to Christ as the only way of Salvation (Luke 24:25-27; John 5:39). Abraham saw His (Jesus Christ) day, and was glad. And even Job, although not of the line of Abraham, was able to gaze through the haze a say in the midst of his misery:
Job 19:25-27 For I know that my redeemer liveth, and that he shall stand at the latter day upon the earth: And though after my skin worms destroy this body, yet in my flesh shall I see God: Whom I shall see for myself, and mine eyes shall behold, and not another; though my reins be consumed within me.
Now, I admit I do not know exactly what point you were trying to make in your post. If you were trying to make the point that Christ was unknown prior to His incarnation, I disagree.
If it was strictly an attempt to uphold the honour of the Trinity, and Tribune nature of God - we are in agreement. I like the Nicene Creed, although I do not pretend to plumb the depth of the nature of God. He IS God - infinite, and omnipotent. He is incomprehensible to any but God Himself. Nonetheless He allows us sheep to know much about Him - particularly revealing Himself through His Son, our Lord Jesus Christ (2 Corinthians 4:6 For God, who commanded the light to shine out of darkness, hath shined in our hearts, to give the light of the knowledge of the glory of God in the face of Jesus Christ).
The Lord Jesus Christ (God the Son) came to Glorify God the Father, and the Father also Glorifies the Son. God the Holy Ghost indwells us and Glorifies God the Son.
Praise God - Father, Son, and Holy Ghost.