Over at the RZIM website they have put together six questions to ask an atheist, here is an excerpt. Many times, as Christian theists, we find ourselves on the defensive against the critiques and questions of atheists. Sometimes, in the midst of arguments and proofs, we miss the importance of conversation. These questions, then, are meant to be a part of a conversation. They are not, in and of themselves, arguments or "proofs" for God. They are commonly asked existential or experiential questions that both atheists and theists alike can ponder.
This is the link to the full article - Six Questions to Ask an Atheist