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The military and Congress are sworn to protect the Constitution, which guarantees the free practice of religion. Insisting on belief in God (as if it were self-evident what the word "God" means) is a violation of the religious freedom of those in military service, including chaplains.
While it may not be true that those without a faith need one, it is demonstrably true that people of faith must have questions and doubts. Otherwise their faith becomes a static, lifeless, self-serving doctrine.