One of the complaints I've often heard from those who are not religious against those who are is the hypocrisy of behaving differently when in church than they do in the rest of their lives. Those who truly worship and honor God, in whatever form, do so in every aspect of their lives, and NOT just in the church or temple or mosque.
In Christianity, we are advised to consider the needs of others. We are advised by our scriptures not to be a stumbling block for others. Mr. Tebow does not obstruct any one's ability to get where they need to go when he gives thanks to God during the course of his work. Nor does he insist that anyone who doesn't like it must watch him. There are many other things to look at in the stadium between plays, like paying greater attention to the friends one comes to the game with. The students in the article noted were stumbling blocks, quite literally. Regardless of whether they were worshiping God, worshiping Tebow, or mocking either, it was inappropriate. It's not about freedom of speech or religion. It's about blocking the hallway during a passing period when serious students would like to get to their next class in a timely manner.