You don't. You leave them alone and respect their right to live their life as they choose to live their life. Atheism is an intellectual decision. Religious faith requires belief in the absence of proof. You have no right to argue with another person who has chosen not to have any religious aspect in their life. They have the right to please themselves, to be true to themselves, and you have no right to interfere with that process.
If you speak of family members, love them and accept their decision. Relate to them on every other level and resist trying to persuade them to "believe". Religion is an extremely personal choice. Allow them the same right you allow yourself: to make your own decision, because it is the ultimate in arrogance to think that you are the one who knows the right way to go for everyone else. You can only make that decision for yourself. Allow the atheist the same privilege you allow yourself: the right to choose their own path without any interference from you.
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