Sparkly Clean Brain---you have a pm.
I think exiting JW's need to work hard to develop critical thinking skills. Confirmation bias is powerful, but if they learn a about the scientific method, which works against bias, they can apply the principals to other areas, even if they cannot apply the actual method. As they widen the lens with which they look at the world around us, it will become obvious that the popular god on the scene, as represented by Jews/Christians/Muslims is a very new god. When one learns that humans have been around for at least 150,000 years by some estimates (adjust accordingly), and even longer if we want to include other human races, and this god has been around for 4000 years, well we can see the problem.
As our scope of knowledge widens, we learn that humans everywhere have set out on very different paths in their quests for answers. Pagan religions, which were supplanted by the bible god, were unique and crafted to the people they served, relying on the environment in which they needed to negotiate. When it comes to religion, they are the most natural and honest, and have a much longer history than the bible religions.
As humans, we have similar experiences emotionally. What a beleiver may call spiritual, I call efferzingpow. Yes, I had to make up a word, because spiritual indicates and external cause for a mixture of emotions that humans experience when they are looking at a mountain, butterfly, listening to music, or just experiencing a deeply moving moment where they feel expansive and peaceful. In Awe. Forgiving. However you experience that feeling of 'spiritual', atheists also experience it, but don't attribute it to the spiritual.
So I think to avoid rebound, we simply have to learn from our mistakes. When leaving a bad relationship, we need to look at it and see where we went wrong, where we were gullible, what signs we ignored. Same with leaving a religion. How did we get snagged? Why did we stay so long? Why did we believe it.
Not everyone will conclude that there is no evidence for a god. But if they learn some critical thinking and broaden their view, at least they will be making well thought-out decisions. And if they honestly continue growing, their outlook will likely be adjusted often, as they investigate new evidence with open and honest minds.
NC