You have the Egyptian army to the back side and the Red Sea in front and no where to go — you are between a rock and a hard place — what do you do?
The people of Israel raked Moses over the coals and let him know that they were not well pleased with dying in the wilderness — read verses 10 & 11
Moses responds back to the children of Israel with “Do not be afraid. Stand still, and see the salvation of the LORD…” Then Moses cries out the the Lord and the Lord gives the way out. Raise your rod and walk on dry land to the other side.
Some have tried to say that the Red Sea was no more than a swampy area where the Israelites could have walked across without God’s help. According to the Scripture that is just not so. First the waters were parted with huge walls of water on both sides. Then the Israelites marched across dry land not some wet marsh and finally when the people of Israel were all across Moses raises his staff one more time and the Egyptian army is completely wiped out under the mass of water drowning them. Just one more miracle of an Almighty God who takes care of His own.
As verse 31 says “Thus Israel saw the great work which the LORD had done in Egypt; so the people feared the LORD, and believed the LORD and His servant Moses.”
We also need to respond to God in the same way “praise Him for His marvolous blessings upon out lives through His Son Jesus Christ.