I've been a blown away by the book Velvet Elvis. It challenges many assumptions we make about faith, and strips it back to its bare essentials.
A quote from the book that particularly struck me was this:
"If the gospel isn't good news for everybody, then it isn't good news for anybody.
And this is because the most powerful things happen when the church surrenders its desire to convert people and convince them to join. It is when the church gives itself away in radical acts of service and compassion, expecting nothing in return, that the way of Jesus is most vividly put on display. ... We have to surrender our agendas. ... I have learned that when I toss out my agenda and simply love as Jesus teaches me to, I often end up learning more about God than I could have imagined."
Mind blowing stuff. The exciting part is living it.