Well, if they like to believe their nonsense and it doesn't do any harm to anyone, I'd say leave them alone. It kind of resembles the way christians want to convert everybody. If someone was having doubts and wanted to talk about it, sure, it would be great to help out, but otherwise it just seems too pushy, IMO.
And I agree with poca, it could really upset them.
And I agree with poca, it could really upset them.