The Availability Heuristic is a well-known cognitive bias that primes people to more readily believe something when they can easily come up with examples. Of the cognitive biases that I’ve encountered among rationalists in the skeptical and atheist communities, this bias is the one I’m most capable of coming up with examples. I am therefore primed to believe more readily that atheists and skeptics are not immune to this bias — myself included.
But there’s a little-discussed inverse to this bias, where examples are generally filtered out of one’s daily existence because they don’t impact on you directly, and thus, you are less ready to believe someone claiming to experience them. I call this the anti-availability heuristic, though I’m sure there are better names for it.