List at least two effects that organized religion has had on society and give examples from past and/or present world events that illustrate your examples.

Try Google searches of the following:
crusades, "war on terror", jihad, "thirty years war", reformation, pilgrims, "spanish inquisition"

Please add to the list the Holocaust.

That being said think about the positive influence that religion has had in such items as the enlightenment the legal and moral codes such as the Code of Hammurabi and Justinian Code. Religion has had a major influence in Science, Art, Music, Literature and other cultural items.

One must not forget the Ten Commandments and the good that has been derived directly and indirectly from religion.

Hospitals, schools, poverty organizations, youth activities, charities....

There's a large list to chose from out there, both good and bad.