"No God of consequence enough to be called great that we know of would approve of such a hateful and cowardly sin against humanity. "
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"But he let it happen."
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True. Very true. God does "allow" a lot of things to happen here on earth....including allowing people to question His existence, His Holiness, His Righteousness, His Justice.....and He even "allows" sinful people to mock Him, ridicule Him, question Him, and insult Him. 
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But not forever. 
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Not "forever" of "non-punishment."