Member of proselytizing religious organization proposes that rationalists direct their attention away from people of an age at which they actually change their minds.

Suspicions of ulterior motives aside, I think this is a really important point: there is a huge cognitive difference between getting someone to join a religious group and training someone in rationality. The former depends almost entirely on social factors, whereas the latter requires a lot more effort from the inductee and depends on their mental state. We should definitely be accounting for this when trying to do rationality outreach, because it suggests that some of the "conventional" religious methods won't work as well.