The past few months have witnessed the emergence of larger, more organized and better armed Syrian militant organizations pushing an agenda based on jihad, the concept that they have a divine mandate to fight. Even less-zealous resistance groups are adopting a pronounced Islamic aura because it attracts more financing.

Idlib Province, the northern Syrian region where resistance fighters control the most territory, is the prime example. In one case there, after jihadists fighting under the black banner of the Prophet Muhammad staged significant attacks against Syrian government targets, the commander of one local rebel military council recently invited them to join. “They are everywhere in Idlib,” said a lean and sunburned commander with the Free Syrian Army council in Saraqib, a strategic town on the main highway southwest from Aleppo. “They are becoming stronger, so we didn’t want any hostility or tension in our area.”…

What began as a largely peaceful, secular protest movement in March 2011 first took on a more religious tone late last summer as it shifted into an armed conflict waged by more conservative, more rural Sunni Muslims whose faith already formed an integral focus of their daily lives.