The best answer to this question is that the Scopes Trial showed the strength of religious fundamentalism. You might also say that the trial showed the strength of Christian fundamentalism.
The Scopes Trial showed that there was a strong strain of religious fundamentalism among traditionalists in American society. Such people were worried about the ways in which American society was changing. They wanted to return to what they saw as traditional values such as those associated with fundamentalist religion. This was why they were so interested in preventing the teaching of evolution.