This is from a summary of Johnsons ideas on the "Wedge strategy" which appeared in "Missionary Man" by Rob Boston in Church and State Magazine (April 1999) http://web.archive.org/web/20010508032051/http://www.au.org/churchstate/cs4995.htm, and not a direct quote. See also "Bad Philip Johnson Quote" at Panda's Thumb http://pandasthumb.org/archives/2006/02/post-4.html
Misattributed
Quotes from work
Wedge strategy
The Wedge Strategy is a creationist political and social action plan authored by the Discovery Institute, the hub of the pseudoscientific intelligent design movement. The strategy was put forth in a Discovery Institute manifesto known as the Wedge Document. Its goal is to change American culture by shaping public policy to reflect politically conservative fundamentalist evangelical Protestant values. The wedge metaphor is attributed to Phillip E. Johnson and depicts a metal wedge splitting a log.