I think this is too cynical a view of religion. Most religious people I've known value truth as much as any atheist, and would know it if they were the subject of this sort of idea control. I know there are plenty of counterexamples, but I think we only see the worst side of religion through the media.
(fwiw., I'm atheist, and I've read Dawkins, but I don't get the whole "militant atheist" movement.)
Most religions have, built into them, a meme for spreading (evangelizing) themselves. There is no such meme for atheism to spread itself. The idea is to put atheism on a more equal footing. Being open about atheism counters conformity:
On the second point, I agree that atheism doesn't have the same self-spreading mechanisms, but most religious people I know don't make any effort to convert other people either. They see religion as a personal thing, are respectful of other people's religion or non-religion, and do not try to push their belief on others.
Also, I'd wager that some religious hackers don't bring it up much because some hackers are really outspoken athiests, and it's a really tedious debate.