Germany has a severe population problem. If you need to have a horde then at least this horde is running away from Islamic freaks and in a generation or two might find Christ.
That is the optimistic view.
Or they might simply be missionaries spreading the word of Allah, while fleeing the poverty of the ummah. Whatever the mindset of the migrants, I'm increasingly getting the impression that Merkel's refugee policy has broad and deep support among Germany's electorate.