Scene 1: Prudence solo
Prudence, Mom & Stepdaddy Gerald are eating dinner without her sister, Hope. Here we learn two things: (i) Gerald is some bookhound who's about to find a real version of the
Necronomicon--a book sharing the secrets of the dead,
and (ii) Prudence and Hope share a special real-time sexual telepathy, and apparently Hope is out fucking some random truck driver.
Feeling aroused herself, Pru retires to their bedroom to read the Bible. Unfortunately, her sister's carnal lust is getting her hot and bothered enough to use that Bible for another kind of salvation.
There's a rather obvious deconstructive moment here where a secular book is being sought to gain eternal life, and the Bible is being used for abjcet lust. Look it up.