I am sorry I did not reply. I was carrying the subject over to other threads. I meant mainly the latter, but since you mention it, we can consider the former as well.
The subject of what Jesus was doing before His Incarnation is pretty clear from the Gospel of John:
John 1:1-14 NASB
In the beginning was the Word, and the Word was with God, and
the Word was God. (2) He was in the beginning with God. (3)
All things came into being through Him, and apart from Him nothing came into being that has come into being. (4) In Him was life, and the life was the Light of men. (5) The Light shines in the darkness, and the darkness did not comprehend it... (10) He was in the world, and the world was made through Him, and the world did not know Him. (11) He came to His own, and those who were His own did not receive Him. (12) But as many as received Him, to them He gave the right to become children of God, even to those who believe in His name, (13) who were born, not of blood nor of the will of the flesh nor of the will of man, but of God. (14)
And the Word became flesh, and dwelt among us, and we saw His glory, glory as of the only begotten from the Father, full of grace and truth.
Before the Incarnation, the Word was in perfect fellowship with the Father and the Holy Spirit! During the Incarnation, the eternal Word of God was made flesh so that we could safely see the face of God in the face of Jesus Christ, and know the love that God has for us through the Incarnation of His Son.
That said, Jesus' sacrifice was efficacious before His Incarnation and sacrifice. Observe...
1 Peter 1:20-21 NKJV He indeed was
foreordained before the foundation of the world, but was manifest in these last times for you (21) who through Him believe in God, who raised Him from the dead and gave Him glory, so that your faith and hope are in God.
and
Revelation 13:8 NKJV All who dwell on the earth will worship him, whose names have not been written in the Book of Life of
the Lamb slain from the foundation of the world.
Jesus' sacrifice was always the plan. What can we discern from these things? God always knew what He was going to do, and God reckoned that Jesus was sacrificed for our sins from the very beginning. Therefore He was able to apply the sacrifice of Jesus to all who had faith regardless of whether they heard the name of Jesus or not.
Hope this helps;
Michael