Question: What is the reason behind religious conflicts?

Answer: There is no one reason, there are multiple reasons and they differ from situation to situation. 

Question: What are some of the major reasons for religious conflicts?

Answer: he quest for political power, economic gain, or deviant religious views. These are some reasons out of many.    

Question: How can we stop religious conflicts?

Answer: Conflicts are part of human civilizational nature, they will end when the human race ends its life in this world.