I don’t believe in God, but if I did, this is the answer I would give to people who wonder why an omnipotent, omniscient, omnibenevolent deity would allow so much pain, suffering, evil, and death to occur in the world:
A woman went out with a weed whip to trim the fence line of a large athletic complex. There were hundreds of yards of fence line that needed trimming on both sides; it was a big job indeed. As the woman began to work, she noticed countless tiny toads hopping about in the long grass near the base of the fence. They were slow-moving and often hopped in circles– if she had waited for them all to move out of the way before trimming, the task would never be completed. She didn’t want to harm any of them, but they were so tiny and numerous and stupid and she had to get her work done. She winced each time she saw a squishy little body eviscerated under her thrumming weed whip, but the work progressed smoothly and, ultimately, would be completed in good time.
So, (here’s the part where, if this were a New Testiment parable, Jesus would explain to the less-bright apostles what the hell he was talking about) in this story the woman is God and the toads are humanity. The job is God’s Will and the weed whip is the instrument of God’s Will at work in the world. God doesn’t want to harm anybody, but humans just get in the way of the divine plan, and if God were always stopping to wait for us to get out of the way the plan would never progress. Of course, the obvious flaw is that this weed whipping woman is clearly not omnipotent, or she would just teleport all of the obnoxious amphibians out of the way of her work (believe me, it’s no fun getting the gooey pink insides of miniature toads splattered all over yourself). Still, if the theists want to pull this one out when the skeptics come a-calling, they’re quite welcome to it
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