By placing a label of "fairy tale" on it, and then, of course, calling you a whiney cry baby for rising to the flame bait. That way, you are dismissed, and then dissed and dismissed, all in one post.
Problem is, religious belief is bigger, more complicated, more relevant, than a fairy tale. THat's an objective, observable fact, even as a deity is not. One doesn't build huge ethical systems around something small and childish. Reinhold Niebuhr isn't small and childish. Gandhi wasn't small and childish. Martin Luther King wasn't small and childish. Religion is bigger, for better or worse, than can be dismissed with a snarky post.
I know it's easier to simply dismiss someone one doesn't agree with by labelling, and fun when it's an insult, but it's pretty ironic that the same people who pretend that rationality and hardheaded empircism and gracious unity with all humanity is their touchstone pretend they can't discern any evidence distinguishing between a belief in santa and roman catholicism, all for the purpose of a snotty little slam.