Freedom of speech is not freedom from criticism.
If I know anything about the NFL, character and behavior take a second seat to game performance. Tebow was a great quarterback at Florida but wasn't good enough for the NFL Not unusual. History has shown many first round draft picks to not make it in the league. Some late picks have become stars like Tom Brady. The various teams Tebow played for wouldn't have cared if he prayed standing on his head if he threw a lot of touchdown passes and won a lot of games.