Well, no one has ever knocked on my door trying to get me to believe in nothing 
Well, there's always this:
Atheists don't need to go door-to-door to "evangelize." They have the schools for that.
Oh, and keep in mind that there's always a media culture prepared to anti-evangelize for religions whenever they believe they can get away with it.
You will find them inclined to ratchet up the rhetoric in ratio to the likelihood that the religion in question might rock some boat or other. Buddhists seldom rock boats, and they seldom catch flak [at least in a mostly civilized society]. Catholics are harder to attack, but they have their vulnerabilities. Anything that can be branded a "cult" (and that still includes LDS) is fair game.
Ironically, if a religion (or cult) is actually dangerous -- you know, violent responses to criticism -- the Press is much more circumspect. Similarly, once a religion figures out that "doing nothing" is how you go extinct, they find ways to hit back, only instead of bombs they might choose to grab an assault lawyer instead.
Public ridicule is aggression. If you plan to survive as a church, you never let that go unanswered. In some cases it's enough to simply prosper beyond the ability of the aggressor to squelch. In other cases you bring on the attorneys.
Religion, as misused and co-opted as it may have been, is still the traditional -- and most reliable -- vehicle of morality and ethical foundations.
Religious intolerance is corrosive stuff.
Eats away the very fabric of a culture.
