Religious sects which even before the war opposed modern technology and avoided its use in their daily life have adjusted to the post-apocalypse situation far more easily than anyone else, and feeling themselves vindicated have come to dominate the post-war society.
Religious groups that even prior to the war rejected modern technology and shunned its use in their daily lives have adapted more readily to the post-apocalyptic environment than anyone else, and feeling justified, have come to dominate the post-war society.