Therefore, as regards the primary points or articles of faith, man is bound to believe them, just as he is bound to have faith; but as to other points of faith, man is not bound to believe them explicitly, but only implicitly, or to be ready to believe them, in so far as he is prepared to believe whatever is contained in the Divine Scriptures. Then alone is he bound to believe such things explicitly, when it is clear to him that they are contained in the doctrine of faith.
—Thomas Aquinas, Summa Theologica, 2a2ae 2.5, resp. dic.
Dear old Thomas!
I admit that I was raised in the kind of environment in which you were expected to doubt something simply because it was in the Bible. Thank God for a change of mind!