Emphasize its meaning of believing in one God, unlike some religions that have multiple gods. In a Unitarian belief system, multiple deities are rejected in favor of one God.
Pro Tip 2/3
Christian Specificity
Make clear that Unitarianism is a form of Christianity distinct from mainstream doctrines. As a Unitarian, he follows Christian teachings but interprets the nature of God differently.
Pro Tip 3/3
Trinity Distinction
Highlight the contrast with the Trinity concept common in other Christian denominations. A Unitarian views God as a singular entity, not divided into Father, Son, and Holy Spirit.