My church uses the Heidelberg Catechism. Recently I came across the following from The preface to The Catechism of the Council of Trent:
The Heretics have chiefly made use of Catechisms to corrupt the Minds of Christians.
For those who proposed to themselves to corrupt the minds of the faithful, aware that it was impossible that they could hold immediate personal intercourse with all, and thus pour into their ears their poisoned doctrines, by adopting a different plan with the same intent, disseminated error and impiety much more easily and extensively. For besides those voluminous works, by which they sought to overthrow the Catholic faith (to guard against which, however, containing as they did open heresy, required perhaps little labour or diligence), they also composed innumerable smaller treatises, which, carrying a semblance of piety on their surface, deceived the simple and the incautious with incredible facility.
Well, that warmed my heart! Reformation theology spread partly because of such documents like the Heidelberg Catechism. Wear your heretic badge proudly.