S.A.M.:
Because (a) I thought it was funny, and (b) I thought it raised the question of whether right and wrong are determined by God in an interesting and thought-provoking manner. It invites people to question what they believe about the origins of morality.
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Did it raise that question with you? Were you invited to question your beliefs?
Can I similarly post what I find funny about atheists that raises questions and invites them to question their beliefs? Can I write something funny as a parody about atheists to demonstrate the ridiculousness of their position?