When Jason Morris' son Cole was two years old, he broke his thighbone and spent several weeks in a full-body cast. The medical bills came to about $13,000, but Morris, his wife, and six children don't have health insurance. Instead they belong to Samaritan Ministries, an organization of devout Christians who chip in to cover each other's medical bills. Following the usual process at Samaritan, members from all over the country mailed the Morris family small checks that added up to enough money to cover all the bills. "We had the emotional side of it," says Morris, "but the financial...