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You're not doubting that he exists. You haven't stopped praying or reading your Bible. You just don't feel anything anymore when you do, and that worries you more than any doubt you've ever had.
Someone else prays with a certainty you almost never feel, quotes the Bible from memory, describes experiences with God you've never had. And you start to wonder whether what you call faith even counts as faith.
When the light goes off and everything looks different, Someone stays with you even when you can't see him.
Even with so many people in the world, God knows you, by name, as if you were the only one.