Hahahha. It's also funny watching Muslims trying to convert Asian countries. In China that gets a person disappeared/jailed/work camp.
In Japan a person trying it gets ignored. The Japanese also knows what is disruptive and dangerous to them. When living on an island resources and livable land is very limited. They can't just let anyone in that will have a harmful affect on overall society. Japan no doubt sees what is happening with their sibling island Britain and said, "Lol! NOPE! Not for us!"
While Japan and Christians never had the best of histories(Government had to Government and Vatican had to Vatican), today's Japan knows Christians won't try to enforce draconian rules and laws onto their society.