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.
In a world ravaged by disaster, religious sects that had previously shunned modern technology have proven more adept at coping with the new circumstances. As a result, they now feel vindicated and hold significant influence over the post-war society.