Not a bad question from an audience skeptic, and a very good response, but it really takes a moment’s thought to realize a ballpark answer. It should be common sense that people of a certain time and place are going to think and act at least a little different (i.e., different than you).
The gospels are an account of Jesus’ activity in the 1st Century. They record Jesus’ interaction with an ancient audience, as He provided them with the kind of evidence they would find persuasive. If Jesus performed the miracles recorded in the Gospels, this evidence is still powerful in the 21st Century.