True. Darwin on Trial is one of the books of the century, although one has to also give credit to Denton's "Evolution: a Theory in Crisis" which was published in1986.
I read Darwin on Trial in the early 90s. Johnson completely dismantled evoltionary theory for me in around 150 pages. Previously I had regarded evolutionary theory as established scientific fact. I remember thinking, "well, it's over. Now it'll take 40-50 years for this to become conventional wisdom."
You should read Kenneth Miller's "Finding Darwin's God". He only takes a chapter to completely dismantle Johnson. (Chapter 4.)