Blasphemous - How to get the "The Path of the Believer" Ending - Part 1

You first have to get, if you don't already have, the item "Immaculate Bead" that is found in "Graveyard of the Peaks" and equip it.
Then, (1) die 3 times, (2) break all "Statues of Confessors", (3) complete all the "Confessor Dungeons" (they show up after breaking each Statue of Confessors), then lastly, (4) just beat the final boss.