Tru dat
Everything in the OT from the sacrificial system to the stories of man's fall to the stories of the judges and kings to the stories of Israel's continual rejection and reconciliation with God to the prophecies of the coming messiah, point to man's depravity and need for and receipt of a savior bringing reconciliation. Everything in the NT points back to the messiah that came and brought reconciliation and who, as it says in Gen. 5:29 "will give us comfort us in the painful toil of our hands caused by the ground the Lord has cursed."
God's fingerprints are everywhere for those who wish to see them. One of the biggest evidences of God is the need for purpose, a deeper meaning to life, an explanation of why things have gone wrong, and an explanation of how to make things right, and a completely inexplicable peace and feeling of complete fulfillment, satisfaction, and unshakeable happiness when walking with God.