The problem of evil
A common problem with other religions is dealing with the problem of evil – how can a good, loving, all powerful god, allow evil to exist.
Haruhiism doesn’t have this problem. We know the goddess Haruhi the be largely self-centered. She cares not about good or evil, but rather interesting or uninteresting.
Mandela Effect
The Mandela Effect is when groups of people remember event that didn’t actually happen. For example, many people remember a movie from the 1990s called Shazaam that starred Sinbad as a genie. However any attempts to find this movie will fail, and instead will find Kazaam, a movie starring Shaquille O’Neal. The cause of this is obvious to Haruhiists, the goddess Haruhi has decided that Kazaam would be a more interesting movie (perhaps she liked Shaq better than Sinbad) and removed Shazaam from the universe, putting Kazaam in its place.