I think it is very unfair to say that, to the point I would call it either extremely ignorant or the worst kind of historical revisionism.
Religion has had, for the most part, a very negative impact on empirical science. Sciences historical origins are anti-religious as they question the current dogma of any given age.
How has religion itself had a negative impact on modern science any more slapstick comedy has helped hinder the progress of science? Perhaps people in positions of power like the Catholic Church during the middle ages use religion as a tool to keep people ignorant by condenmning and executing anyone who challenged biblical scripture; But any tool, religious or non-religious could have helped keep the masses helpless and stupid, if there was one person or a select group of people who had enough power to influence and control the masses. You know, The father of modern physics and one of the igniters of the Enlightenment era, Issac Newton , was a religious nutjob and devoted more studying the bible than studying science; Yet , his religious idiosyncrasies did not deter him from establishing classical physics and creating calculus ; Islamic texts during the middle ages inspired muslims to create and developed the modern branches of science we are all familar with and they established many scientific institutions. (http://en.wikipedia.org/wiki/Science_in_medieval_Islam )