[Nathan] De Lee [an astronomer at Vanderbilt University] is one of a growing number of Unitarian Universalists, a group of people who believe in organized religion but are skeptical about doctrine. The denomination grew nationally by 15.8% from 2000 to 2010, according to the Association of Statisticians of American Religious Bodies. Although they remain small in total numbers with about 211,000 adherents nationwide, Unitarians believe their open-minded faith has a bright future as an alternative to more exclusive brands of religion. They might be right, said Diana Butler Bass, author of Christianity After Religion: The End of Church and the Birth of a New Spiritual Awakening. Bass, who has studied thriving progressive churches, said Unitarian Universalists can fill a niche in conservative religious cultures such as the Bible Belt. “I think there is a role for these kinds of more open and liberal spiritual groups,” Bass said. “They provide a nice counter-cultural community.”