On May 27, 2025 the Vatican Post Office issued stamps and a postmark that commemorated the 1700th anniversary of the First Ecumenical Council of the Church, convened in 325 A.D. by Emperor Constantine in Nicaea (modern-day Turkey). Here the Church addressed the Arian heresy regarding the nature of Christ, solemnly affirmed that the Son is “of the same substance as the Father,” thus proclaiming the full divinity of Jesus Christ, produced the first formulation of the Nicene Creed, still central to Christian faith today and established important norms for Church life, including a common date for Easter. Which of the following best explains why the Nicene Creed remains important to Christianity today?