Always bear in mind that the "Atheist" KNOWS down deep that there's a God (and LIES when he claims there's not), and does their best to BURY that awareness in favor of their own selfish beliefs. NOBODY can break that deception except the Holy Spirit. That's why Paul limited his evangelism to: "Jesus, and Him Crucified". Reasoning with an "Atheist" is as useless as talking to a cement block.