'la Chiesa' aka 'The Church' (1989) – Michele Soavi.

Visually astute, fascinatingly inventive, multi-talented Italian Film-maker/actor Michele Soavi was already a cult figure of quite some considerable repute by acting in iconic genre films by maestro Lucio Fulci, Lamberto Bava, and the supremely proficient DP turned legendary director Joe D'Amato, but then rather emphatically established himself as a gruesomely gifted genre director of enormous promise with the howlingly good Giallo classic 'Stage Fright', and the more black-hearted horror fans prayers were resolutely answered in Soavi's sensationally Satanic, Cathedral-set, bloodily blaspheming sin-drenched, soul-slashingly sinister shocker 'The Church'. While the narrative foundations to 'The Church' are solid, this vastly imposing Gothic Cathedral is built upon the restless remains of those misbegotten multitudes cruelly slaughtered by the insanely irreligious Knights Templar, and on one especially fateful day when the increasingly curious librarian (Tomas Arana) all too foolishly attempts to unlock the storied cathedral's myriad eldritch mysteries, the guileless scholar inadvertently unleashes a terminally toxic torrent of torrid torment, intoxicating lurid lusts, and savage, sanguinary slaughter in master of the macabre Soavi's earthquake eerie, ground-shakingly ghoulish, deliriously demonic, hell-spawned 80s horror classic 'La Chiesa', with its menacing, darkly monochromatic score, monolithically morbid medieval mysteries, calamitously creepy climax that quite demonstratively brings the house down, it would be a most grievous sin for any shock-hungry Gore-met to miss it!