Have you read the documented accounts of the division caused within the hundreds (if not thousands) of churches by the "40 Days" Warren program? The Wall Street Journal has done two stories so far, and the editor at the WSJ could probably write a book, just from the amount of information that was gathered.
We did it in our church and we suffered no division. I didn't see a lot of personal growth either, but we're all still there and growing larger all the time.