I strongly disagree with a number of the sentiments presented by the OP. First off, I cannot help but think that the attitude of trying to emotionally 'convert' people to atheism will backfire harshly. It especially seems that it is like challenging theists on their home ground, using their weapons, and ignoring the fact that they're well-prepared to defend against those sorts of tactics.
Second, it ignores the fact that many theists are themselves decent and good people. With irrational beliefs, certainly, but how many people are not irrational in some respects? The important thing is not whether a belief is irrational, but what the result of holding that belief is. If they become better people as a result of holding a belief
, then it is hard to see how that could possibly be a bad thing, regardless of whether the belief itself is irrational.
Third, I don't think it's realistic to think that religion can be cleansed from the world. Certain sects of Christians worked very hard to wipe out 'pagan' religious beliefs, such as the Greco-Roman pantheon, yet those beliefs still exist in the world despite more than a thousand years of suppression. It is unlikely that radical atheists could succeed in that, especially since religion tends to thrive on persecution. And how exactly would you go about "cleansing the world of religion", anyway? It's easy to talk about something like that, much harder to put it into practice without becoming worse than the 'problem' being 'cleansed'.