The Naiku (Inner Shrine) is the more important of the two shrines, as it is dedicated to Amaterasu, the Sun Goddess and supreme deity of Shinto.
THe Naiku is the more important part of the Ise Grand Shrine.
I find it interesting that Alfred Gingold, in Onward, Christian Clothiers, doesn't have a problem with pro-abortion T-shirts or vulgar T-shirts (shit happens, coed nude basketball, bitch on wheels, etc.) but finds it necessary to tee off on evangelical Christian apparel.