Why could Israel not redeem herself in the Exodus?
Israel could not redeem herself in the Exodus because she was helpless: enslaved, with no armed forces, no economic or political clout. She could do nothing to deliver herself. Redemption therefore had to be accomplished by God Himself, using Moses as His proven deliverer and requiring the blood of a lamb.
Les teaches that the Exodus was a redemption in which God Himself does the redeeming. Israel was in a position where she could do nothing: she had no armed forces, no economic clout, and no political clout. They were just slaves, servants, helpless. Redemption also required a person, Moses, who had to be proven as the legitimate leader and deliverer by the sign miracles—his rod thrown down became serpents, and his hand became leprous and was healed. Those signs proved to the Jew that Moses was God's man to deliver them. God further required the blood of a lamb placed on the doorpost, or they would not have survived. In the New Testament, the Lamb is Christ, and the New Testament substantiates that.