I'm not sure if this is precisely the correct forum for this, but if there is a better place, I don't know what it would be. At any rate...
I'm a student a Catholic university, and there are (as one might surmise) quite a lot of Catholics here, along with assorted other theists (yes, even some in the biology faculty). For this reason, I find myself acquiring more and more devoutly Catholic friends, and some of them I have grown quite close to. But the God issue keeps coming up for one reason or another, which is a source of tension. And yet as I grow closer to these people, it becomes clearer and clearer that each theist has a certain personal sequence of Dark Arts-ish levers in eir head, the flipping (or un-flipping) of which would snap em out of faith.
So the question is this: in what situations (if any) is it ethical to push such buttons? We often say, here, that that which can be destroyed by the truth should be, but these are people who have built their lives around faith, people for whom the Church is their social support group. If it were possible to disillusion the whole world all at once, that'd be one thing - but in this case my options are limited to changing the minds of only the specific individuals I have spent time getting to know, and the direct result would be their alienation from the entire community in which they've been raised.
And yet it is the truth.
I'm conflicted. LessWrong, what is your opinion?
It's very believable. I'll give a couple of techniques here.
Reinforce skeptical behavior while modifying their self-image to that of a truth-seeker: "I love talking to you because you pursue the truth over comforting lies". Be genuine, and by that I mean use the tone you would use to tell someone that their suit looks good.
Give high-status cues. Assume the role of teacher or mentor. Once they want to become more like you, merely expressing your beliefs (not opposing theirs, but expressing yours) will make a significant impact.
Demonstrate that giving up religious belief won't result in isolation. How exactly you do this will vary based on the social context.
There are a couple others, such as generating low-status associations with religion, which is a bit advanced and so not worth covering here, and creating false memories and comittments, which is scarily easy to do but absolutely dark arts and therefore not covered here.
You will note the absence of "rational argument" on this list. That's because rational argument is rather ineffective for changing the mind of the person you are arguing with (though it may change the views of observers).
Really horrifyingly scarily easy. (Most of the comments thread.)