The atheist doesn't believe in G*d, and so therefore, the children will think that if you try hard enough, good things will happen and you can do anything. But this isn't truth! If you work hard enough, you will find people that undo the work you try to complete, and you end up trying to keep up all this work (or give up and live a depressed life). While if they are a believer, they show that a true belief in G*d brings a greater treasure to them than hard work alone: compassion, and eternal life. Compassion is possible in the secular world, but is not common. Of course, no offense to anyone like Tebow or Brees or anyone, but an athlete isn't the only role model- material people out there. Parents, teachers, firefighters, etc. Are all perfect role models. And as written,
A christian youth usually looks up to a christian role model. An atheist, etc. youth usually looks up to atheist role models. Of course there are always exceptions. If you can find me one athlete that has the same description you gave, tell me. As far as can be seen, most athletes are in it for some general things:
*money
*women
*fame
*win the game
*a way to get into college
Very few times do you see characters like Tebow and Brees that are football players for what looks like the fun of it and honoring G*d.
I guess you ask Cieza, if an atheist can be a role model. Sure, but not everyone (Christians and non-) would look up to this person. A lot of youths and adults even, look up to dictators and such.