The premise of this book is fairly simple. An atheist decided to "sell his soul on Ebay" or in reality to take on the burden of having to attend the church of the winning bidder's choice for a number of times commensurate with the winning bid. In this case, the winning bidder, one former pastor, decrees that Mehta visit a variety of churches and write his views on his experiences.
As a result, the author makes various excursions, both in his own area, and to some churches of national recognition, (one is Joel Osteen's megachurch) and observes not only how people react to him as a visitor, but to the program the church presents. All this is done as an atheist with an open-minded view as to how it is all done, with an eye on how each church could potentially be drawing or even repelling the potentially unsaved masses.
As a church-going Christian myself, I think that there is some interesting views that the author makes that can be taken into account for many churches. For instance, he says and I think rightly so, that too many churches have a long song and praise session that may tend to bore those who are new to the church. Actually, there are probably more than a few members of these churches who harbor the same feelings (myself as one).
Taken for what it is, open-minded people from both sides of the church door should find this book pretty interesting. I won't give away whether or not the atheist becomes a Christian, you will have to read the book to the end to find that out, but you can be entertained in the meantime with his observations.
Rate this one 6 stars.