Matt Tarka speaks with the confidence of the faithful. Discussing a trip he will soon be taking to Northern Uganda to spread the word of Christianity, the details roll off his tongue like he’s describing an upcoming camping trip, with enthusiasm and confidence. He and four other missionaries—representing three Fort Collins churches—have flights booked, itineraries mostly finalized and contacts in Uganda awaiting their arrival. They’re working out their ground transportation, gathering aid supplies like clothing and toys, and hosting fund raisers to pay for the mission’s considerable expense. But most importantly, they have their goals firmly in mind. “We want...