Be warned that when approaching the subject of religion with atheists (especially with an eye to conversion) that many atheists you are likely to meet were brought up in or around the Christian faith. Many once believed, honestly and wholeheartedly, were actively involved with their church and held as true all aspects of the faith. In time these ex-Christians, through personal reasons came to a place where they did not hold the beliefs anymore and turned away from them. Frequently they had questions in their religious life and beliefs and went seeking answers, some in discussions with their priest, pastor, peers, and some studied the Bible, studied philosophy, religious history, comparative religion, and science. You may believe you are bringing them a fresh and bight message of good news, one they are unaware of, but they may have a greater academic knowledge of their ideas of their subjects than you do of yours. Such questioning leads to them to dismissing their faith. Some have a background not only of a Christian faith but also have information about a large number of other religions, philosophies, history and science. Also, if they have lived it, they know what it was like to be a believer in church, and had experienced the light and love of God. Many openly admit they miss the clarity and community/cultural aspect of church and Christianity, but believe that to feign a belief simply to re-gain that, would be hypocrisy for them. And, as atheists, they find it hard to pretend. So be careful, and think more than twice before attempting to convert your atheist friend. Talking with your friend on the subject of God and faith just might open questions you can't readily answer, and might cause confusion or doubt.