Religions naturally struggle for adherents. Some, like Islam and Christianity, fought both 4GWs (Fourth Generation Wars) and COINs (Counter-Insurgencies) to win. Others, like the rotting corpse of Communism, use suppression and intimidation.
Now Robb links to a new form of attack.
The moral? There will always be conflict. But more complex societies allow enable more peaceful fighting, with zealots and their enemies fighting in DNS and wikis, instead of tanks and blood.