Pondering an image:
Take an egg, apply consistent heat, the 'white' actually becomes white, it changes from a liquid into a solid, from something with potential to something consumable. The egg remains an egg, but it is denatured.
The same can apply to a faith. Apply consistent pressure, before you know it, it has changed out of all recognition. It is still 'faith' - the words used might be identical - but the living content has become denatured.