Former Muslims (Ex Muslims) are those people who left Islam and their number has been around 5 million in the whole world.. The largest numbers of former Muslims are in America, Canada, Pakistan, Indonesia, United Arab Emirates, Turkey, Russia, Iran and India. After leaving Islam, they switched to different religions but most of these people follow Sanatan Dharma (Hinduism). They believe that Sanatan Dharma is the true religion of the world and it is also scientific.