Me and a friend of mine were arguing about whether it was disrespectful of the Detroit player to imitate Tim Tebow’s “praying” gesture. (If you haven’t heard about it, you can read the details here.) I took the position that it was as legitimate a thing to do as any such celebration is. She argued it was disrespectful and rude.
Personally, with this sort of light-hearted taunting, I don’t think it’s wrong in the context of a football game. Obviously, you wouldn’t mock somebody’s religious practices in the course of daily life. But then, you wouldn’t run up and tackle someone in the course of daily life, either.