Who is preaching to you? You want to know the difference between the two things you mentioned are? One is a private matter that isn't stated in protest, and the other is something that entire teams are doing, and it has often been done in the middle of our National Anthem. You use the word religion, but there are a lot of different beliefs. As a Christian myself, I have a lot of problems with "religions" that pop up around the world. But if I see someone praying during a game, and I know he isn't a Christian, I am not offended. I would wish that the person where not praying to some pagan "god", or whatever else, but I believe in his right to have his religious freedom. It isn't something that is in your face, and making a political statement.

Major difference.