Large scale conversion to Islam in South Korea

That was common in a lot of European colonised Africa, since Islamic groups already existed there and accepting them was less likely to cause problems compared to Christian proselytism (which was also accepted, of course), so this led to a spread of Islam under European rule, mostly to "animist" groups.

I think the growth of Islam was after independence. And being an ex-Portuguese Colony makes it less likely.
 
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