With over 1.3 billion adherents (1/5 of the world's population) it has a lot of fading to do.
There is a saying that goes "There is a sucker born every minute"..
This saying is incorrect, allow me to prove it.
If you multiply 60 minutes times 24 hours you get 1,440 minutes, times 365 days = 525,600, so that would mean that 525,600 suckers would have to be added to this world every year for the saying to remain true.
Now take the fact that 3 people are added to this world every second..(see link)
http://www.ibiblio.org/lunarbin/worldpop
That adds up to 180 humans every minute, 10,800 every hour, 259,200 every day, 94,608,000 every year.
1/5th of the world is Muslim, so 1/5th of 94,608,000 is 18,921,600, so that means every year 18,921,600 Muslims are added to this world.
What does this prove? That the saying is incorrect. A sucker is not born every minute. 18,921,600 Muslims are added every year divided by 365 days = 51,840 divided by 24 hours = 2160 divided by 60 minutes = 36.
So the true saying should be "There are 36 suckers born every minute"