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You literally have to UN Believe. sounds hard.
A big spurt of spiritual growth occurs when we learn to not project our own feelings and thinking onto others as if everyone has to act and feel they way we do because we do. I learned this lesson and it's a very valuable one. It's actually key to being able to love unconditionally as Jesus does, and which we are commanded to do.
Just because we're not tempted that way doesn't mean we do not have to make room for the struggling believer who is tempted to go back to the world in unbelief. Google 'Charles Templeton' some day when you have a spare moment.