When you reject the binding interpretations of the historic Faith there is no doctrine that is safe. Moreover, the history of doctrine shows that the rejection of Marian doctrine leads sooner or later to the rejection of the Christological and Trinitarian affirmations. It is Marian doctrine and devotion that preserved the truth of the Trinity. When the Christian believer sees the biblical portrait of Mary as Daughter of the Father, Mother of the Son and Spouse of the Holy Spirit, he grasps forcefully the distinctions between the Three Persons. The doctrine of the Trinity becomes a reality for him.
On the flip side, the idea of “Jesus alone” with no reference to Mary leads to a focus on God only as Father (Jehovah’s Witnesses and some Fundamentalists) or a focus on Jesus that excludes the Father and the Holy Spirit (most Fundamentalists) or an exclusive focus on the Holy Spirit (most Charismatics/ Pentecostals).
With a healthy Marian devotion comes an authentic understanding and a conscious grasp of the doctrine of the Trinity. Marian doctrine is equally important for Christology. For instance, the declaration that Mary is the Mother of God said two clear things about Christ: He is one Person, a divine Person; He is a human being because His mother is human. Once the declaration of Mary’s Divine Maternity was rejected the next step was to reject the affirmation that Christ is a divine Person.
mariology.com/sections/introduction.html
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