Yeah, I agree. I was just trying to clarify the intent of the comment.
But also I think that's the point of that line of debate. It is an attempt to show a religious stance from an atheist perspective in which belief is a while load of possible strange things accepted as true. It's not really much use other than when you're faced with someone who things your lack of theism is the opposite of their particular brand of religion and frames the discussion around which bits you have issue with, as if they might prove to you that you're wrong. Or to show that their belief that their religion is correct and all the others, including atheism, are the wrong ones, isn't really the other side of what an atheist thinks.
More a thought experiment than meant to characterise the entirety of atheism.
Ah, I see. We don't tend to put it to the mouth. It's more "fuck you". Apparently comes from demonstrating to the French that you still have your bow-drawing fingers and intend to use them. British archers captured by the french would have their first two fingers removed to prevent them launching arrows.