God saves his fearful, doubting people by parting the Red Sea and he defeats the Egyptians by causing the Sea to fall back on them. He does this all to show his power over Pharaoh and his forces, and the people of Israel praise Him in response. This salvation story points forward to the greater salvation story where God rescues His people from their sins through the cross, and they praise Him for eternity. 

Resources:

Resources:

Exodus: 14-15 ESV Study Bible (Exodus Notes & History of Salvation)