Many Muslims and websites claim that Islam is the fastest growing religion in the world. As proof, they usually present us with unverifiable claims and baseless media quotes. Apparently ABC News had claimed “Already more than a billion-people strong, Islam is the world’s fastest-growing religion”, a quote which cannot be traced to its source. Also CNN World News stated “Fast-growing Islam winning converts in Western world”, a statement which they fail to back up with any evidence. However, if we examine the actual data available for Islam, it reveals that Islam is neither the fastest growing religion by number of adherents or the fastest growing religion by percentage-increase.
The growing number of Muslims in the world is due primarily to the higher than average birth-rates, and consequent population growths of Muslim countries and communities. And their growing presence in non-Muslim societies such as Europe and the Americas is overwhelmingly due to immigration. Furthermore, converts to Islam are vastly outnumbered by those who choose to leave the religion and embrace another faith or worldview. And the majority of converts that Islam does manage to attract, decide to leave within the first few years of practicing it.