A tiny number of very fringe people believe the Democrats-abduct-kids thing
Based on the ubiquitousness of certain memes, I think there are more than you believe. Unless all the posts on qanoncasualties and hermancainaward are fictional.
Memes are a few kb of data and can be copied ad infinitum by a few actors.
Opinions are complex brain structures and take time to develop and grow in the population.
An abundance of the former has almost no correlation with the later.