The NFL looks at this as an intellectual property (trademark and copyright) issue. The actually send cease and desist letters to bars, churches, et al when they call things "Super Bowl" parties because they don't want the trademark diluted. When it comes to public showings, they claim that it is a copyright violation if admission is charged; however, I believe bars have a statutory exception. I'm not saying what the NFL is doing is right but I really don't think they are being anti-religious, I just think they are motivated by other things.
Hmm.
What about individuals who have large homes and big screen televisions who invite a mob of friends over for a SB party?
Is that breaking the law too?
What is the world coming to?
FWIW, I've always frowned on churches having Superbowl parties. It is not suitable for the house of God IMO.