/lit/ - Literature

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Atheist (Technically Agnostic)
>Anything else
I think location should be added as well. You're right that most of the Internet (referring to 4chan/reddit I'm guessing, not facebook or likewise) is outspokenly Atheist. But remember that it's most common for someone who participates in these arguments to be from some relatively secular place - almost anywhere in europe, most places in US, etc - but others are from places where at least the question of religion is closer to the front of the mind.
>Jackson, Mississippi