define the meaning of the world fastest religion ?
Is it by converting , or birth ? or based on the percentage ?
now you asked a big loaded question and I wish to comment on it
in my view , it’s a myth to say islam is growing by conversion in the west fastest than any other religion (at least by numbers) for example , I read that 20 , 000 people convert to islam in the US per year (75 % of them leave it in 5 years according to Dr. Ilyas Ba-Yunus) , but the Catholic Church for example gain 114,000 converts in the US per year . so by conversion islam is gaining converts , but so is mormonism and JW ( in fact , I believe those are having even more converts !) .
another thing I want to address is the rise of islam in Europe , it’s true that islam is growing there , but why ? because Europeans forgot to built families and ignore the church teachings , while Muslims didn’t become part of the culture and each islamic family bring many babies and mary between each other(or marrying native European and raising the kids as muslims) , that grow happen between the 1990s and the 2000s .
take france for example , in 2000 , there was 4,155,000 muslim in france , most of them were born muslims , only 40,000 were converts . the rest were immigrants or born from an immigrant father or mother(most likely north Africa ) , so it’s true that islam grow in france , but to say it’s grow (both in number and percentage) due to people attractive to it is not the case .
As for why islam seems attractive ,or even gaining converts
First because Christians don’t understand their faith , which leads them to not know how to answer muslims missionaries (who not only attack the bible, jesus divnity ,and the meaning of the cross but also use all the liberal literature against the bible (for example bart ehrman) to shake the Christians beliefs) or to explain basics fact like jesus divinity from the bible. and my country did very great job since the 80s to spread islam for it’s agenda .
Second because they see islam is so simple faith and the trinity is so complected , but in this case JW and Judaism is as attractive as islam , right ? so just because a person doesn’t understand the trinity it doesn’t make islam right .
Third , many christians doesn’t live the teachings of Christ and his church (at least in the apostate Christendom of our days) , muslims do live a morally life (at least from what they believe to be moral) , so for example they will tell you muslims don’t drink , don’t have sex , woman must dress Modesty while you Christians do that
Fourth , islam known from the Missionary , not from it’s books and arabic sources , I once quote a hadith from bukhari ( an authentic book about the sayings of muhammad) to a convert muslim , and he said to me that I am lying and this hadith is from shia islam (even though bukhari is a sunni book and have nothing to do with shiaism ) . so westerner muslims (born there , or converts) can’t read the materials in arabic , and put their trust in their shaikhs and imams . so those who convert have no idea about islam as a whole , they only see what the missionary want them to see , that’s way when people show them the bad islam , they will accuse as of islamphobe and lying because they have no clue what we are talking about !
Fifth , there is not a lot of works (in the west and in the middle east) which shows the origins of the quran , and islam for example , people don’t really know that many stories in the quran comes from fabrication books that date to the third to the 7th century , such as the infancy gospels or Pseudo-Matthew gospel. or even examining the claims about the kabba (the black cube) and knowing that pagan arabia already have similar practices , so this point is connected to number 4 in the sense that they just believe what the missionary will tell them , but not examining the data .
Finally , is Islam the biggest religion in the world ? no , is it bigger than the Catholic Church ? yes ,but the reason is (1) Protestants rather than putting all their effort to evangelizing muslims ,communist ,or even their own society. they wanted to have fast converts and have no headache so they went to south america !!! and(2) because Catholics don’t stick with the teachings of the Church and build families !
now imagine if south america was still catholic , and Europeans had babies , Catholic will be The world largest religion , but it’s not about Competition and numbers(which muslims love) , it’s about saving souls ,and islam is against christ divinity and cross (2peter 2:1-2)