So the Lord saved Israel that day out of the hand of the Egyptians, and Israel saw the Egyptians dead on the seashore. 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.
Exodus 14:30-31 NKJV
Isreal went to Egypt on good terms but there was a Pharoah who turned against them and made them their slaves. It got even worse when Moses, the one who was supposed to get them out of Egypt, made, what seemed to be, a bigger mess of the situation.
But, Israel got to see ten miracles God did in order to show the Egyptians who the real God is. Then He performed another miracle by killing the Egyptians in the sea. At this point they feared the Lord and believed.
At what point did you begin to fear the Lord and believe? Have you told anyone recently?