good analogy but not practical.. Those region didn't have strong language, belief and culture. Like Africans. North African were tribal with no education, developed language, strong ethos and mature religions . Muslims came so they became Muslims. For South Africa, christian came so they became christians. Resistance occurred like Muslim in India. 800 yeras rule, but still not in majority. Neither British could convert them to christianity. Similarly for british in China, No mass conversion. Tribal societies like Afghan, Arab, Mongols, Aztec, Native Americans, Mayans, Malay, Indonesia, Africans, aboriginals were easy to be converted. As invaders/foreigners had already developed language/religion/culture so they overwhelmed locals in every manner.
@Joe Shearer @jamahir @waz @Indos