Muslims all across the internet have for some time been claiming that Islam is the fastest growing religion. Not true! Christianity is still growing at double the speed of Islam. Islam is only growing in countries where to not be a Muslim could get you killed. In the evil empire of Saudi Arabia, to leave Islam will probably get one killed. The fastest growing branches of Christianity are Pentecostal and Charismatic/Evangelical. Catholicism is also still growing.
Statistics are easily manipulated to show Islam growth, but Christian growth is exploding before the return of Jesus. As well 100,000+ christians are killed every year for their faith. Yet where they are being killed the growth is still explosive. You would have to live in a fantasy world to believe the statistics (by muslims) on Islamic growth.