Americans have long feared religious groups they do not know. Islam and Buddhism are among the least liked religious expressions in America today. New research, however, indicates it does not have to be this way. Getting to know evangelicals, atheists, Muslims and Buddhists as individuals leads to greater acceptance of people of diverse beliefs, Robert Putnam of Harvard University and David Campbell of the University of Notre Dame suggest in their new book “American Grace: How Religion Divides and Unites Us.”