This is a classic case of telling lies by muslims to say that their religion is superior and so everyone is converting to islam....the 50,000 number that u gave above is propagated only by islam glorifying websites (as they dont have any other work).... This is because, US govt doesnt have a policy of counting its population by religion unlike India....so only muslims every Tom ,Dick & Harry are coming up with these kind of numbers and spreading lies.....also if u see the christian websites, they claim that theirs is the fastest growing religion....the ONLY SCIENTIFICALLY PROVEN FACT IS THAT MUSLIMS HAVE HIGH FERTILITY RATE AND CAN SO MULTIPLY LIKE RATS WHEREEVER THEY GO...also islam has got a clever RULE to kill anyone who leaves islam....so we never know how many ppl are infact actually leaving islam....
Finally dont feel elated that islam is growing in numbers....remember its the quality that matters, not the quantity....remember Jews (who make up the 11th largest religion in the world, unlike islam which makes up 2nd largest) are fu**** muslims a**** in the middle east from the last 50 yrs!
