I agree with you that Scientology is a cult. However, you will have to choose a different piece of evidence to further your point here -- that Scientologists believe that humans are descended from a race of aliens is a much better option, one that most can sign onto as being freaky. Additionally, a lot of people follow others around to extreme; they're usually stalkers, not Scientologists. Katie choosing to be a stay at home mom is a completely normal decision that millions of women all over this country make every day. In fact, I would argue that Katie's decision to stay home is a sign that she may still be with us in the normal world. Now, if she decides to use the Scientology childbirth method then I would have to concede that she may be too far gone.
Oh, that silent birth thing? Yeah, that sounds absolutely nuts.
I am all for one parent staying home with the kids. Both my parents had to work, but my dad worked 3rd shift, so he was awake when I got home from school everyday. Let's just say that at least once a week, something in the house would either get broken, burned or somehow screwed up (my dad is the ultimate tinkerer/gourmet chef and was eager to pass his "skills" on to me). I think I had the most fun finding out everyday what our new project was and exactly how we were going to hide the usual disasterous results from my mom.