|A scene from the TV show Family Guy,|
as quoted on Google+
I'm going to spoil this one for you, on the topic of whether religion slowed the rate of human progress, I think the answer is clear: no, it did not. However, I also think that you can point to some serious "one step forward, two steps back" moments in history, especially as concern Europe and its recent (last 2,000 years) affair with the Christian faith.
It would be impossible to cover the entire history of the interaction of religion and human progress, but I do want to talk about some specific high (and low) points that I think make this topic a bit clearer. I should be up-front: I'm not a member of any religion, but I'm not an atheist. You can read more about my personal beliefs in my post about deism.