My 5 sources

http://www.debate.org/opinions/does-religion-divide-the-world

https://www.quora.com/Does-religion-unite-us-or-divide-us

http://www.telegraph.co.uk/news/religion/12064796/Religion-has-been-dividing-human-society-for-2000-years-say-scientists.html

http://www.smh.com.au/federal-politics/the-question/does-religion-unite-or-divide-us-20110422-1drac.html

http://m.huffpost.com/us/entry/6015614