Willow Creek Community Church in the Chicago suburb of South Barrington, Ill., pays attention to design. The sprawling complex, on an attractively landscaped 155-acre site, includes not only two sanctuaries but also a gymnasium that serves as an activity center, a bookstore, a food court, and a cappuccino bar. Goss/Pasma Architects of Evanston, Ill., did not include any traditional religious symbols on the exterior: no steeples or spires, no bell towers, no pointed arches, not even a crucifix. It doesn't look like a place of worship, but what does it look like? A performing-arts center, a community college, a corporate headquarters?