"Your great-grandchildren will be under Sharia law." -- Kidd
"It's hard to make predictions, especially about the future." -- Yogi Berra
Actually Yogi, this is pretty simple.
Non-Muslims have enough babies to maintain their numbers.
Muslims have enough babies to double their population every 20 years.
Eventully, there are more Muslims than non-Muslims.
Then, the Mulims get to make the laws.
"Nobody goes to that mosque anymore, its too crowded" - Yogi Berra's great grandson of the future