One benefit, I guess, would be if they find something in the brain or body somewhere that can be switched off!
It's a nice thought for atheists to entertain ... but if we think about it more seriously, is it feasible?
It does kind of sounds like a nice idea; designing a procedure which will clear the way for rational thought, but before long we're into the realm of Walter Freeman's cure-all practice of the
frontal lobotomy by swizzle-stick (a.k.a. the "white cut") or ice-pick-through-the-eye (a.k.a. "transorbital lobotomy"). "Corrective" neurosurgery for non-fatal conditions should be avoided at all costs, no matter how well we think we know the brain. It's interesting that we all have a similar "floorplan" to our brains, but the wiring within similar "rooms" is unique between individuals. It is also interesting that if areas of the brain are underutilised for their "normal" purpose, they can be drafted-in to help in other brain functioning. A person, blind since birth, will still have a functioning -but small- visual cortex but it may be used to enhance olfactory or auditory processing for example. By analogy, consider adjusting the floorplan we discussed earlier to replace the conservatory with a small study and extending the kitchen (or more aptly; a utility cupboard).
Like my usual ramblings, I am carrying on a bit long but be reassured; I'm getting to my point ...
So even if we know where to "switch it off" would we want to? How sure are we that we know the effect on all other normal processing in the brain? There are a few studies on the kind of "all around the brain" development that is required to make a fully functional human being. From the study of feral children we now know that if lingual development is prevented until the age of 8, after this point it is impossible to completely learn how to use language. An inability to process grammar, being key to our social abilities as humans, prevents understanding much of our world and by our standards, such a person is retarded or has a very low IQ.
All of this was by way of introducing that a recent study has discovered the area of the brain which is used to experience the presence of god/the holy spirit/the glow of the glorious one. The
BBC documentary which covered this discovery sent Professor Dawkins to "try it out" and see what it feels like to experience god. He didn't report any profound experience. There are two ways to look at this result; perhaps, being told in advance what to expect, he was expecting more than he got or perhaps in his floorplan he has found the need for a library rather than a sunroom to feel The Glow.

I find it interesting to find the need in believers to make adjustments to their beliefs to fit the new evidence ...
Just because there are circuits in your brain that predispose you to religious belief does not in any way negate the value of a religious belief. Now it may be god's way of putting an antenna in your brain to make you more receptive to god.
It would be very surprising if we didn't discover more about the physics and chemistry of those parts of our bodies which are a process, the various bits of enjoyment we receive from religious belief. I think Christians and maybe other religious believers have absolutely nothing to fear from further investigation, indeed should be keen on it and canny when it comes to the interpretation of it.
Like Dawkins, can we all try to remove the sunroom and redesign our brains? A cognative psychologist would say that it isn't only possible to do this, it is natural, that we should "let it happen".
Less seriously ... I personally haven't been to a church service in probably 14 years so the last time I used my "aerial" was many years ago. Right now I'm trying to expand the library and cram-in some trigonometry, after all it has been explained to me as a "beautiful" subset of mathematics ... I've just never felt that way about it. I'll keep you posted if I feel the imaginary coefficient of the cosine of theta revealing universal truth to me.
