Growing up in an ostensibly reform-Jewish household that didn't even take that seriously, atheism was easy for me, so I don't know how hard deconversion is, how much it hurts, or how much of one's entire conception of self is trashed in the process and can't be recovered.
As an atheist, it's tempting to say, "Look, it's not that bad: God doesn't exist exist, but you can still go to church and praise God and stuff if you want; it's just that there are benefits to being honest about what you're actually doing and why."
Somehow, I suspect that this is not a very convincing sell.
Applications to other topics are—as always—left as an exercise to the reader.