Noah tells himself that he’s joining the Mennonite Mob to gather enough evidence to put away the bad guys.  He reasons that if he carries out this task then he will protect his community from police intrusion, thus preserving their “closed” nature.  In reality, by putting himself in danger, Noah is throwing down the spiritual gauntlet and challenging God to show Himself by intervening on Noah’s behalf.  If Noah survives long enough to accomplish his mission, then he will know that God is protecting him - and therefore Noah’s faith is not in vain.  At the same time as Noah’s trying to get the goods on the bad guys, he has to take care of his duties as a father, dairy farmer and pastor. The farther he goes, the bolder and more dangerous and guilt-ridden he'll become.