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?
The following point is of interest primarily to the OP and is orthogonal to the OP's question.
You should maybe spend some time looking at the foundation of your rationality, as this statement rings some alarm bells.
Probability estimates should be numbers, not ranges, unless you're doing something nonstandard. I can understand saying something like "I don't want to commit to saying anything about the probability of event A beyond 0.25 < P(A) < 0.3 because I don't trust my brain's probability-assigning hardware/software". But your range is really wide, and includes probability 1! I don't think you believe that you are certain that you can convert people, so it looks like you are not clearly reporting your probability judgment.
I'm addressing this in your comment, which I've ignored in a lot of other comments, because it looks like you're doing this towards a self-serving end. The conclusion you're reaching for is that you'll convert someone, so you claim a lower bound for your probability estimate that let's you assert this. (Incidentally, a conversion probability of 33% gives you a (1 - 0.33)^3 = 30% probability of converting none of the three people.)