As long organization that is doing these deeds have an Islam in its name, you can't say Islam has nothing to do with any of this. Same organization is major force on territory where Islam is dominating. French citizens who pulled this off are most likely considering themselves as Muslims.
Orthodox Christianity is true religion of Christ, it's really a shame many high ranked priests are driving around in expensive SUVs, plated in gold from head to toe. Not to mention how often they are seen in company of criminals, whores and other shady people. Last but not the least, their violent speeches that literally call people to murder each other shouldn't be forgotten. But none of that does matter, because Orthodox church is one true church of piece and human salvation