DAYTONA BEACH, Fla. — On Sunday, the Rev. Ronnie Barton found himself comparing the trials of the Christian life to the challenges confronting Nascar race teams. He was preaching to about 40 race fans in a 20-by-20-foot tent amid some 1,000 recreational vehicles and motor homes on the grounds of Daytona International Speedway, where fans have been gathering for Speedweeks, the prelude to the Daytona 500.