It is common sense that says a religious man or woman does not commit certain acts, whether or not of illegal nature, due to an implicit moral interdiction which comes from believing in God or gods, ​but that does not make sense when you put two and two together and take into account religious people commiting crimes.
There is no basis for religiously-driven evolution of society in the sense that the teaching have stayed the same, but society advanced. Societal changes are due to Science and Technology and ,in extremis, philosophy's. Overall, human interaction has improved ,again, preponderantly due to the last 3. It is unquestionable that religious zealotism, along with it's self-imposed impoverishment would have crippled the entire society.
Atheism has nothing to do with decadence. It is admirable, but It would be decadent for one's self if one's morality depended on not taking into account others. I.E. "God said that" , "God said this" , but without a clear frame of reference, this is inflexible and potentially harmful to others.