Jesus is throughout the whole of the OT. He is the Word, He is the Creator, He is God. There was no NT before Jesus. He is the spirit and fulfillment of Prophecy.

John 5:46-47
46 If you believed Moses, you would believe me, for he wrote about me. 47 But since you do not believe what he wrote, how are you going to believe what I say?”

If Genesis isn’t true, the gospel doesn’t make sense. In this presentation, Calvin Smith exposes how belief in evolution didn’t just attack creation—it shattered the need for salvation—which is why our culture doesn’t care about the gospel anymore.

https://youtu.be/lSwEouC26sQ?si=w4xA72o9lEMhIIHS