Yes, he was, at one time.
Read about my journey back to the past where I met the legendary kung fu master:-
I met Fei Hung some years back and he confirmed that he was a Muslim during Kublai's reign. Then, he was called Hang Horsein Kublai.
Before that, he was the master incarnate Rinpoche Tencent Tubten.
Afterwards, he reincarnated in the Middle East near where Jesus was thought to have been born, as the
Noting that China after Lao Tzu was bereft of spiritual help, he decided to reincarnate as the legendary kung fu master Fei Hung.
Few people realised that he was not just a kung fu master but also a spiritual adept of the highest order. The few who did, were said to have become enlightened themselves.
That was the least known aspect of the Fei Hung. In fact, nobody knew that Fei Hung was a spiritual avatar, not even Fei Hung's nearest kung fu disciples.
But Fei Hung as Fei Hung, the kung fu master extraordinaire, was never a Muslim.
So, I am myself puzzled. As Fei Hung, he was a Chinese who believed in ancestral worship.
As Hang Horsein Kublai, you have to ask him. That is, if you know how to travel back in time.