All that has to be done is to say, "I don't believe it," and the un-believer is in a tenable defensive position behind some faith. If they can get enough other ideologues to say, "Me too!" they're in bidness. Denying-further-proof-sandbags line the top of their wall, and they can see threats very well through a tall periscope that somehow turns into a kaleidoscope, or so it seems, listening to them describe events.