Also, do you have any direct evidence in your claim that Japanese are more skeptical? The Aum Shinrikyo death cult got almost 10% of the vote in the mid-90's.
According to todayifoundout, US schools aren't nearly as bad as the meme likes to portray them [1].
[1] https://www.todayifoundout.com/index.php/2015/01/kids-get-su...
And are you really going to give lessons on the mythology of Japan to people who live in Japan? That's perhaps a tad presumptuous, especially considering it's like telling people living in Britain that witches are part of British folklore.
I mean, please.
I found that amusing. I have tons of these, most of them amuse me. Try living here and (among the many other notions you have of the place that are no doubt wrong) you'll see there's a huge amount of superstition, regardless of education level.
If you can't afford to come, https://www.reddit.com/r/japanlife/ is a good resource. It's amazing how much that sounds absurd is true.