Atheists - do they exist?
I'm of the conviction that atheism isn't really an issue and that self-proclaimed atheists are really something else entirely.
I think that when we witness to people, we can't take how they label themselves at face value. I believe that when we share God with somebody, we have to really find out where people are actually at, instead of where they think they're at, and meet them there. That requires discernment and understanding and the willingness to seek God on their behalf so we can give them what they really need and tell them what they really need to hear, and not reason with them on their terms, but on God's.
Even so, come Lord Jesus!