Making the Manifesto: The Birth of Religious Humanism by William F. Schulz (Boston: Skinner House, 2002). Trends in Western thought and culture that led to Religious Humanism as a movement in the early 20th century.
Becoming More Fully Human: Religious Humanism as a Way of Life by William R. Murry (New Haven: Religious Humanism Press, 2011)
Find out more about Unitarian Universalists Humanists at HUUmanists
Unitarian Universalism is not the only declared humanistic religion. Ethical Culture is a religion "centered on ethics, not theology, whose mission is to encourage respect for humanity and nature and to create a better world." Humanistic Judaism "combines the celebration of Jewish culture and identity with an adherence to humanistic values and ideas."