I'm doing research for an oral presentation I have to give in one of my college classes and I chose the topic "How would the world be better if religion never existed?". Of course I'm doing my own research but there are some smart people on this site too who might know a thing or two about the subject.
Please no fights about religion. I'm looking for anything that has been caused, influenced or justified because of religious reasons that has caused any type of damage. It can be war, oppression, unlawful things, stalling certain scientific fields from developing or just about anything that you feel made humanity take a step back or held it back from taking a step forward. Also if you can mention extinct religions or smaller ones, not just the bigger ones like christianity, muslim, judaism, etc. that would be awesome.
AGAIN please no fighting, this is not to debate which religion is better or worse but to gather information.