How so? Explain.
Being MOrmon is an all or nothing proposition. You are either ‘active’ or a ‘jack mormon’ (inactive).
Being ‘active’ means - they attend services (every week or nearly for at least 3 hours), they have church jobs (Romeny was the equivelent of a pastor at one point), they go to other members houses as often as they can (considering their schudules) to give lessons, they pay titihing, they wear the holy underwear, they were married in the LDS temple (which is about 25% of LDS), they took oaths to put the LDS church (not God not Christ) first above everything else and to use their influence to build up THE CHURCH (again not God, not Christ). They keep the health code, they read the Book of Mormon, they submit to the Prophet. I can go on.
They are very very very devout and that only happens if you really believe it.