Anybody who's anybody should check out the most recent sermon series at Mars Hill Community.
They brought the pain especially on hell and witnessing.
They told the story about the blind man who was healed with Jesus' spitwad. How the man, when asked about the healing, repeated "I don't know". It's okay to not know all the answers. What's most important is that my life has been changed for the better b/c of Christ.
[edit from original post: the sermon series (title of the post) can be accessed on the link above. the first one by rob bell is a little scattered, but the rest are more direct and a pretty interesting examination of how God desires to change Christians...rob seems to be talking about people who think they have it all together and rather than having the love and mercy of Christ, use their Christianity/religion as a weapon against the world rather than an invitation to the world.]