Which practice expresses belief in the Trinity?

• A. Sign of the Cross
• B. Apostles' Creed
• C. Profession of belief in the Trinity
• D. The Lord's Prayer

Answer: (C)

Belief in the Trinity means affirming that there is one God in three persons: Father, Son, and Holy Spirit. A profession of belief does this most directly because it is a formal declaration of that specific faith. When someone explicitly states belief in the Father, the Son, and the Holy Spirit, they are articulating the Trinity in a clear, intentional way. That direct declaration makes it the best fit for expressing belief in the Trinity.

The other options relate to Trinitarian faith in different ways: a gesture like the Sign of the Cross recalls the Trinity and is common in prayer; a creed such as the Apostles’ Creed contains the Trinity in its statements but is a broader confession; and the Lord’s Prayer is a model prayer addressed to the Father, with underlying Trinitarian context but not a direct profession of belief in the Trinity.