Inscrutable

http://commons.wikimedia.org/wiki/File:Caspar_David_Friedrich_Eule_auf_schmucklosem_Baum_1834.jpg

Advance the word GOD through the alphabet and you get OWL, SAP, and WET:

god owl sap wet lettershift

Whatever that means. Further multistep lettershifts:

ADD-BEE-ILL
BUS-HAY-PIG
IRK-RAT-VEX
MUD-WEN-AIR
OAF-WIN-COT

If we admit words of differing lengths, some interesting coincidences appear:

honey nut bar lettershift

day light lettershift

hood zipper lettershift

tub model ship lettershift

And, disturbingly,

demon go now lettershift

Perhaps that owl is telling us something. See A Hidden Message.