You don't need to enter the church to proceed to next area, but you won't proceed into the story if you don't go ahead and enter Evelyn's secret lair and afterwards enter the church.
Edit: I mean, you can even proceed, but the story will be weird.
Also, what are you planning to do that requires not using the scroll? (Or are your characters against breaking into a suspect's house to investigate?)
Last edited by kurausu; 31/07/14 04:52 PM.