This is a good lecture that deals with the topic. Christians, when confronted with this topic, often like to retreat to their fortress of "It's our own fault". We're the ones who inflict suffering. This essay cuts through that baloney in some places.
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If a good and infinitely powerful God governs this world, how can we account for cyclones, earthquakes, pestilence and famine?
How can we account for cancers, for microbes, for diphtheria and the thousand diseases that prey on infancy?
How can we account for the wild beasts that devour human beings, for the fanged serpents whose bite is death?
How can we account for a world where life feeds on life?
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If this God exists, how do we know that he is good? How can we prove that he is merciful, that he cares for the children of men? If this God exists, he has on many occasions seen millions of his poor children plowing the fields, sowing and planting the grain, and when he saw them he knew that they depended on the expected crop for life, and yet this good God, this merciful being, withheld the rain. He caused the sun to rise, to steal all moisture from the land, but gave no rain. He saw the seeds that man had planted wither and perish, but he sent no rain. He saw the people look with sad eyes upon the barren earth, and he sent no rain. He saw them slowly devour the little that they had, and saw them when the days of hunger came -- saw them slowly waste away, saw their hungry, sunken eyes, heard their prayers, saw them devour the miserable animals that they had, saw fathers and mothers, insane with hunger, kill and eat their shriveled babes, and yet the heaven above them was as brass and the earth beneath as iron, and he sent no rain. Can we say that in the heart of this God there blossomed the flower of pity? Can we say that he cared for the children of men? Can we say that his mercy endureth forever?
Mark Twain expressed some similarly profound thoughts, that outline the kind of suspended reason shown by believers on this subject.
The best minds will tell you that when a man has begotten a child he is morally bound to tenderly care for it, protect it from hurt, shielf it from disease, clothe it, feed it, bear with its waywardness, lay no hand upon it save in kindness and for its own good, and never in any case inflict upon it a wanton cruelty. God's treatment of his earthly children, every day and every night, is the exact opposite of all that, yet those best minds warmly justify these crimes, condone them, excuse them, and indignantly refuse to regard them as crimes at all, when he commits them. Your country and mine is an interesting one, but there is nothing there that is half so interesting as the human mind.
- Letters from the Earth