which aspect of the roman catholic church established in the 300s remains today quizlet
History of Christian theology The doctrine of the Trinity, considered the core of Christian theology by Trinitarians, is the result of continuous exploration by the church of the biblical data, thrashed out in debate and treatises, eventually formulated at the First Council of Nicaea in AD 325 in a way they believe is consistent with the biblical witness, and further refined in later councils and writings.[1] The most widely recognized Biblical foundations for the doctrine's formulation are in the Gospel of John.[1]