Some atheists have challenged the universality of Islam, saying it is only 25% of the world's population, and almost absent from many regions of the Americas and east Asia. What is the response to this objection?

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Some atheists have challenged the universality of Islam, saying it is only 25% of the world's population, and almost absent from many regions of the Americas and east Asia. What is the response to this objection?
Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answer updated 2 years ago

Islam is the only religion which addresses all human beings and deals with all of them with equality with out any discrimination. Islam states the fact: All human beings are from one father (Adam) and one mother (Hawwa).

Political reasons caused depriving many people from knowing Islam. When people are able to know Islam, millions will embrace it because it has The Real Evidence from God which can never be found in any other faith or ideology.

Number of followers is never the only evidence of the reality of any religion or idea because we need to study the political reasons. Intellectually, Islam is the only religion which has the rational answers for the questions of those who think properly.

Scholars from all over the world admit the superiority of Islam which has has resulted despite all the obstacles, in making Islam the most spreading religion in the world today. https://www.bbc.co.uk/news/av/world-39279631

Wassalam.