Lots of great ideas. Thank you everyone. The one statement that stood out was:
OneEyedJoe: I don't know how I could live with myself if I didn't say something and they ended up getting sucked in to the cult.
I think that about sums it up for me.
I have a pretty good relationship with the neighbors. I think I can broach the subject without coming across as Mrs. Kravitz. I' ll go armed with that brochure from jwfacts.
Thanks all!