Jesus was rebuking them mildly because they did not trust him to take care of them. This can be written as a statement. AT: "You should have had faith!" or "You should have trusted me!" (See: [[rc://en/ta/man/translate/figs-rquestion]])
"What kind of man is this ... obey him?" This question expresses the shock and confusion over how Jesus was able to control the storm. (See: [[rc://en/ta/man/translate/figs-rquestion]])