The vans line up well before 8 a.m., and there will be more at noon. These big models, full of car seats, take time to unload. Then moms in veils or straw hats strap infants to their torsos and follow their husbands, themselves with toddlers on each arm, across the parking lot. These Catholics are flocking to St. Mary's Church, de facto home of the Latin Mass in the mostly rural Diocese of Kalamazoo, for a distinct religious obligation.