You could also just knowingly lie to them. Christians do that all the time with e.g. Santa Claus or the Easter Bunny. IDK if I’d do that, but if you’re fine with lying about Santa Claus (which often ends up being scary to children, too, especially when you have people pretend to be Santa), lying about an afterlife seems like a smaller issue.
I grew up in a nonreligious (nominally christian) household, this kind of thing was never an issue for me.








Knowing their child’s worldview sounds like it absolutely would be a parent’s business. It’s pretty central to who someone is as a person. Of course you don’t want to force them to tell you, but most people aren’t cagey about this if they trust their parents.