There were 1.6 billion Muslims in the world as of 2010--roughly 23% of the global population--according to a Pew Research Center estimate. But while Islam is currently the world's second-largest religion after Christianity, it is the fastest growing one. The growth of Islam ought to be concerning for liberals. Here is a religion that sanctions forcing women into submission, a religion that sanctions the execution of gays, a religion that sanctions the killing of non-believers. And they're spreading. Islam preys on the most vulnerable in society, offering them a sense of higher purpose. It's no wonder gingers (ahem Lindsay Lohan) convert to Islam in such high numbers. They also have especially high conversion rates in jails,