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The conversation should be one-on-one, and it should be during a relaxed time when nobody needs to hurry to go somewhere else. It should happen in a private or semi-private place, like at home, at a coffee shop, at a park, or during a walk around the neighborhood. You don't want to make someone feel embarrassed, blindsided, or trapped. If they look awkward, drop the idea. This allows them to gracefully decline if they would prefer not to talk about it and gives them an opportunity to start expressing their thoughts and ideas if they are in the mood. Some people feel awkward or uncomfortable talking about religion, especially since religious discussion can result in heated debates or hurt feelings. For example, you could say "I've been thinking a lot about religion lately, and I was wondering if you feel like talking about it." Respond gracefully if they say no. Don't push. If they say no to you several different times, assume it means that they are very shy about religion and don't like talking about it, so it's best to stop asking. If the person feels ambushed or attacked, they'll shut down and have no interest in what you have to say. Thus, try to keep an open and friendly tone, without pressure for them to act a certain way. You want them to be comfortable with you. Not every atheist is open to being converted, and it's important to make peace with this. Don't whine, wheedle, or browbeat your way through a conversation that someone else doesn't want to have. If someone says "I don't like talking about religion," then stop bringing up religion. If you offer to talk about religion a few times, and they say no each time, that pattern may mean something. Stop bringing it up, or ask "I've noticed that you've declined each time I asked you about religion. Is it a topic you're uncomfortable with?" Then stop if they say yes.
Choose a good place and time. Bring up the subject and ask if they're interested. Keep your mind and heart open at all times. Know when it's best to leave it alone.