Could it be that the that the French Muslim soldiers were killed because they were serving in an 'Infidel' military? It's not unheard of that they would do something like that. Targeting a Jewish school is all the traits of Muslim extremists. The Norwegian shooter did not kill his victims because they were Christian. The guy was simply deranged.
Zimbabwean charged over killing of Cecil the lion (Reuters)
from the article: Four killed in shooting at Jewish school in France