Being Proud

So you're sitting in church and the pastor has just preached a message on salvation. We all know what is next; "Everyone bow your heads and close your eyes". Then, as you sit there with your eyes closed, he talks to those who aren't saved and tells them that God is calling them to salvation. Then he says, "If you want to be saved, please slip you hand into the air". That drives me crazy. Doesn't God call us to be radical and unashamed of him? Why do we try to hide our salvation from those around us? Why can't the pastor instead say, "If you want to be saved, please stand up right now and come up on stage and prove that you are willing to give your life to him, no matter how crazy you may look?" God calls us to do crazy things for him, so why would be start off our relationship with Him by hiding it from others?