Six year old, easy choice - do something mildly special for a kid that age and get on TV then when they ask you a question the answer is 'well it was a dream i had, there was a pale horse riding towards us snd the horses name was Tod, it was going to run over everyone but an angel told me to call out to the faithful and save them....'

Kid can't even read and from an atheist family then starts quoting bible and making up complex visions and messages no child could ever create - plus very clear predictions that come perfectly true, knowledge of science before it's discovered... Admit it, you'd get sucked into my cult.

Could have a huge portion of the world believing, teach them the need for luxury gay space communism then when we're all living in utopia be like 'oh btw it was just a time travel prank lol'