I don't think it "belongs" to either element, but as you have suggested there may be different styles of approaching the topic that depend on one's IM preferences.
Originally Posted by A Grain of a Song of Sand
An interest in mysticism and mythology has also been related to the enneagram, in particular to the mental predilection of type 9, that at times is mistaken for Ni. This was posted over at enneagram institute boards by someone who types as a nine and who himself draws upon mysticism and mythology in discussions of enneagram:
Dreams, mythology and symbols are all once-removed from reality; they're representations of real life. On the other hand, 7w8s are interested in taking a big bite out of real life. For a 7w8, there's not enough juicy meat on the bone in the world of symbols.
Mythology perfectly clicks with the 9w1's version of "abstracting from reality", as Riso puts it. The 9 idealizes and the 1-wing is searching for 'the ideal'. This makes for a fascination with the up-and-away denizens of Olympus. The gods are not people, so there's no risk of conflict - they're simply ideas or people as streamlined perfected concepts. This all taps the 9's brand of 'autism' - an inner sanctum where lust and violence can occur in a safe contained space (far away from reality), as well as half-animal creatures frolicking in ever-sunny meadows.
There's nothing for a 7w8 to experience in all of that world.