I remember when I was a kid, laying on the floor on a map (like I was flying), with a towel around my neck draped over my back, making that wshhhh flying sound with my mouth. And why do you have to have your fists clenched when you fly?
CT reviews Superman Returns (includes tips for parents at the end):
when Lois, bitter after Superman's absence, tells him that the world doesn't need a "savior," he replies, "Every day I hear people crying for one."...But we shouldn't make too much of this sort of thing. The Superman movies have never shown anyone actually following Superman's inspiring lead
In addition, whereas the first film had an almost mystical sensibility that lent itself to religious allegory, the new film does not.
(More details on if the movie is for your family here)