I. The Red Sea crossing was the actual point of deliverance from Egypt:
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At the straits of Tiran, they were finally free from Egypt!
It is our conclusion, that the Bible describes Israel as being "out of Egypt" in three senses: 1. The day they departed. (civil residential sense) 2. The day they crossed the Red Sea. (theological and practical sense) 3. The day they crossed the Jordan and entered the promised land 40 years later. (final sense)
Just before crossing the Jordan, Rahab came to Joshua and stated the general opinion of the gentile world: "For we have heard how the Lord dried up the water of the Red Sea before you when you came out of Egypt." Joshua 2:10. In other words, the Gentiles saw the Red Sea as when Israel left Egypt and was totally free. Even the Gentiles viewed that from the "practical" human perspective, the Red Sea was the specific point at which Israel formally escaped Egypt's control.
In the "final" sense, Joshua confirms they hadn't fully made the transition out of Egypt until after they crossed the Jordan. Joshua 5:5 says "but all the people who were born in the wilderness along the way as they came out of Egypt had not been circumcised." This verse proves that even those born after the crossing of the Red Sea were still coming out of Egypt because they had not yet entered the promised land.
From a "theological" point of view, the Bible clearly states that it was precisely at the crossing of the Red Sea that God delivered Israel from Egypt. Ask a Hebrew when they were free from Egypt and they will say after crossing the Red Sea.
"Thus says the Lord, the God of Israel, 'I brought Israel up from Egypt, and I delivered you from the hand of the Egyptians and from the power of all the kingdoms that were oppressing you.' " 1 Samuel 10:18
"'I brought your fathers out of Egypt, and you came to the sea; and Egypt pursued your fathers with chariots and horsemen to the Red Sea. 'But when they cried out to the Lord, He put darkness between you and the Egyptians, and brought the sea upon them and covered them; and your own eyes saw what I did in Egypt. And you lived in the wilderness for a long time. " Joshua 24:6-7.
"Thus the Lord saved Israel that day from the hand of the Egyptians, and Israel saw the Egyptians dead on the seashore. When Israel saw the great power which the Lord had used against the Egyptians, the people feared the Lord, and they believed in the Lord and in His servant Moses." Exodus 14:30-31
"So Jethro said, "Blessed be the Lord who delivered you from the hand of the Egyptians and from the hand of Pharaoh, and who delivered the people from under the hand of the Egyptians. " Exodus 18:10
"but because the Lord loved you and kept the oath which He swore to your forefathers, the Lord brought you out by a mighty hand and redeemed you from the house of slavery, from the hand of Pharaoh king of Egypt. " Deuteronomy 7:8
"Now this came about because the sons of Israel had sinned against the Lord their God, who had brought them up from the land of Egypt from under the hand of Pharaoh, king of Egypt, and they had feared other gods " 2 Kings 17:7
"For I do not want you to be unaware, brethren, that our fathers were all under the cloud and all passed through the sea; and all were baptized into Moses in the cloud and in the sea; and all ate the same spiritual food; and all drank the same spiritual drink, for they were drinking from a spiritual rock which followed them; and the rock was Christ. " 1 Corinthians 10:1-4
So theologically, the Red Sea was their deliverance from the bondage of Egypt. This is reinforced by Paul's statement in 1 Cor 10:1-4 that the Hebrews were "baptized into Moses" at the sea, which was a figure of the Christian's full immersion water "baptism into Christ" (Gal 3:27). The Jews were saved from the slavery of Egypt when they were immersed in the Red Sea. Christians are saved from the slavery of sin when they are immersed in water in the name of Jesus