Final answer:
William, as a psychologist, practices dualism by keeping his religious beliefs and professional practice in psychology separate, acknowledging the contributions of both without merging them into a single worldview.
Step-by-step explanation:
William, as a psychologist who actively engages in his faith but chooses to keep his religious beliefs and professional practice separate, subscribes to a form of dualism. Dualism, in the context of psychology and theology, refers to the idea that mental and physical (or in this case, scientific and spiritual) phenomena are distinct and operate according to their own principles. By maintaining distinct methodologies for his faith and his psychological practice, William might be comfortable with the notion that both provide valuable insights into the human condition without necessarily merging the two into a singular world-view.
The balance he strikes between his religious commitments and his work in psychology implies a recognition of the unique contributions and constraints of each domain. This sort of dualistic approach allows for a nuanced perspective where professional and personal beliefs can coexist without conflict, respecting the methods and knowledge bases of both his faith tradition and psychology.