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How to understand people who believe in god (for atheists )
Visit different houses of worship.
As an atheist, it's easy to completely isolate yourself from different religious schools of thought, but this is ultimately not helpful for your growth. Visit as many different religious services as you can and try to form relationships with as many different people as possible.
Ask a christian friend to take you to a sunday service. Ask a jewish friend to invite you to their shabbat dinner.