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How do you know when a religious "pull" is really mental illness?

I am Bipolar, and have been an atheist for years. Recently I've felt drawn to Christianity, which has caused a lot of inner turmoil because IMO Christianity doesn't make sense. How can a person tell if religious feelings are "normal" or manifestations of a mental illness? I can't trust my own judgment; I once thought it was a really good idea to live in my car.