WASHINGTON - At First Baptist Church of Glenarden in Prince George’s County, Md., parishioners who don’t make it to church on time are directed to an overflow room to watch the Sunday service on a huge projection screen. If they can’t make it to church, they can catch the service online anytime. The Church at Severn Run in Anne Arundel County, Md., has a wireless network in its cafe that lets parents work and peruse the Internet while waiting for their children to finish Sunday school. And at McLean Bible Church in Virginia, fancy lighting, rock music and occasional...