Future demographics and current rates of births, deaths, conversion and apostasy point to Islam becoming the world's largest religion sometime in the middle of the 21st century. Europe will almost certainly be majority Muslim by then. So will many regions of the world. There are already around 50 majority Muslim nations on Earth. Since Islam punishes apostasy with death and makes every baby born to a Muslim father a Muslim (except for Obama), while encouraging Muslim brides to stay barefoot and pregnant, the demographics definitely point to Islam taking over sometime in the next 100 years.
Unless Jesus returns, or we stop them. I am hoping for the former and planning for the latter.