no, i am afraid it is not true, kind of fantastic theory with no evidence

Wong Feihung's first biography was written in 1933 by his second generation student Jyu Yujai (student of Lam Saiwing, who studied under Wong Feihung form 20 years). none of the old and new Chinese/Hong Kong sources mentions that Wong Feihung was a Hui (ie. Chinese Muslim). my sigung has studied with Lam Saiwing (his uncle) from 1916 to 1943, i am sure that Lam Saiwing would mention something like this to him. (and btw. Lam Saiwing's nickname was Jyu Yu Wing, ie. "Porky Wing", as he worked as a butcher when he was young. he brought pork meat to Wong Feihung on regular basis)

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however, Chinese Muslim martial arts are very famous in China, check out eg.

http://en.wikipedia.org/wiki/Muslim_...e_martial_arts

but Hung Kyun is not the case, although today it is practiced by people of all races, nationalities and religions

all the best