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Much like politics, religions prey on people's fears, and often promote their theology based on the specific fear of going to hell, or suffering some other form of eternal torment. Religion, at a fundamental level, should be based out of love, not fear. On top of this, if you challenge their perspective, claiming that, as a human being, you cannot believe that a God would create seven billion humans, only to have several billion of them go to hell, they immediately consider you rebellious and sacrilegious. This, I believe, is the primary issue affecting most religious institutions today.
In the words of the late Bill Hicks, "Eternal suffering awaits anyone who questions God's infinite love."