These are all things taught in the Bible, and taught by Christianity. But they are also taught by all the world's other major religions. You needn't believe in a sandaled, Christian God to recognize your mortality and the fleeting nature of earthly glory. You need only look at last year's fading film star or the author nobody reads anymore. None of these things is important.
None have any lasting value because they're artificial.
Nobody benefits for any length of time if Dallas wins the Super Bowl, or if the Bulls take the NBA championship. There is probably a woman on your school's PTA or a man in your Lion's Club that has done more for humanity than Michael Jordan ever will. These people will live and die in obscurity, grinding along every day with bills to pay and kids' braces to get. But their spare time isn't spent glorifying themselves or earning another jillion dollars they can waste on overpriced toys. Their fleeting time on earth is spent teaching a bored youngster to field a grounder, or to paint a watercolor.