Bikers riding through Alabama on the Trail of Tears Commemorative Motorcycle Ride Sept. 21 were greeted by Alabama Baptists, the gospel message and a bottle of cold water.     Volunteers from Tennessee River, Madison, Limestone and Colbert-Lauderdale associations were on hand as an estimated 130,000 motorcycles rode from Chattanooga, Tenn., to Florence. Each year since 1994 bikers have followed the…