The explanation behind the unanswered questions is that the plane was taken over by the co-pilot and deliberately crashed into the mountain in the Alps in a case of suicidal mass-murder which explains no SOS signal. He had complete control of the plane after locking the Chief pilot out of the cockpit.
How many moslem pilots are flying planes everyday?
Make sure their not depressive and having a bad day when flying because the thought of 72 virgins and killing a bunch of infidels might send them over the edge and into a mountain or tall building.
This Germanswings crash might just be a case of mass-murder/suicide with no religious context but seems unlikely given the state of current World affairs.
But you never know...