Since you say that you believe what St. Thomas taught do you agree with the following statement?
St. Thomas, Summa Theologica: “After grace had been revealed, both the learned and simple folk are bound to explicit faith in the mysteries of Christ, chiefly as regards those which are observed throughout the Church, and publicly proclaimed, such as the articles which refer to the Incarnation, of which we have spoken above.” (St. Thomas Aquinas, Summa Theologica, Pt. II-II, Q. 2., A. 7.)