Real meaning: Someone who doesn't believe there is a God (an atheist)
Modern meaning: An insulting label used by strict religious people sometimes just to atheist/agnostics, but also to anyone who doesn't follow his/her religion.
Note: Calling someone a heathen, depending on the person, could be seen as very disrespectful.
She doesn't go to church??! omg, what a heathen!
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