There can never be any real disagreement between faith and reason, since it is the same God who both reveals mysteries and infuses faith, and who has endowed the human mind with the light of reason. God cannot deny himself, nor can truth ever be opposed to truth. The appearance of this kind of inane contradiction is chiefly due to the fact that either the dogmas of faith are not understood and explained…or that mere opinions are mistaken for the conclusions of reason.

-The First Vatican Council on Faith and Reason, The Christian Theology Reader, 31.

In your experience, have you encountered (both personally and with others) more misunderstanding of dogma or more opinions taken for reason?