Just because God delivered His people didn’t mean they were out of the woods. After they crossed the Red Sea they were confronted by many nations who were their enemy. And that is what happens with us, especially after we become Christians. We’re thinking we’re on easy street now and instead it seems like we are pursued by every nation on earth. The Amalekites did not like the Israelites and were bent on killing, stealing and causing spiritual doubt among them. Kind of like what happens in our lives as Christians.