At the risk of offending many of you, I say that had there been no religion, that yes, we would likely be more scientifically advanced. Many religious institutions (I'm looking at you Catholic Church) have persecuted men of science with pain and death for speaking scientific truth, which was labelled as heresy. Medicine would be so much further along had autopsies been possible before the turn of the 19th century. Before then, only the horrifically injured gave any indication to the body's internal workings.