I don't think it's an exaggeration. Religion has done more harm than good to the advancement of mankind and knowledge. In the past, they burned entire libraries, suppressed scientific research, persecuted those who tried to learn.
Yes, soem have done that but lets not forget thjat it was the church that funded and supported many of the past great scientists also and that for a long time, the chruch supported universities and schools.
I disagree that it has done more harm than good.
Some of history's greatest scientists -- Newton, Pasteur, Galilei, Lavoisier, Kepler, Copernicus, Faraday, Maxwell, Bernard and Heisenberg -- were all Christians, and the list doesn't stop there. Some important scientists, such as astronomer Nicolaus Copernicus, were actually Catholic priests!
Besides the biologs website, you cna go hear for more info:
Today, they do it by politically fighting and outlawing research, such as stem cell research. (A whole 'nother topic, I know.)
Not stem cell research but embyronic stem cell reaserch.