Here in Texas, as far as I know, religious symbols and the like are not allowed. Of course, as the poster above me mentioned, we are required to love and have faith in our sporting programs (football and baseball).
My kids are in private catholic school, but play on the football team that feeds into public school (city team), since our school doesn't go all the way to highschool, he enters public school in 7th grade). He wants to go to public, though, to play sports. Friday night lights is HUGE here in Texas. And as a season ticket holder to the Texas Longhors, he gets lots of football exposure.