Vis a vis your link:
About 20 years ago, I heard the author of
The Fugu Plan: The Untold Story Of The Japanese And The Jews During World War II, Marvin Tokayer, who is a scholar of Far Eastern Studies somewhere or another, give a lecture.
In the course of his lecture, he gave over the following anecdote, which he appeared to relate as having actually happened.
I don't know about that, but here it is:
In the 1300's Rome sent its first Jesuit missionary to establish a Mission in China.
He got there and set up shop, garnering zero interest from the Chinese.
After several months of living in China, with no interest and no converts, a Chinese man walked into his mission. Speaking very poor (Latin? Italian? French? beats me...), he exclaimed to the missionary how happy he was that finally, someone had arrived representing the True G-d! He went on in his fractured combination of Chinese and the missionary's language at how wonderful it was that the missionary was here and he went around the room and bowed respectfully to a couple of pictures the missionary had hanging on his wall.
The Jesuit was astounded and finally asked the Chinese "How do you know about the Son of G-d?"
The Chinese looked puzzled and apologized for his poor understanding of the missionaries language and asked him to explain.
The Jesuit asked again "Where did you find out about The Church of Rome?"
Again the Chinese apologized and asked for explanation.
The Jesuit said "How do you know about Jesus Christ, our Lord and Savior?"
The Chinese expressed his total confusion and bafflement.
The Jesuit then asked, "Well why did you bow to the pictures on my wall?"
The Chinese apologized profusely, begged that he had not offended the missionary, and asked him to explain what the pictures were...
The Jesuit replied: "Well, this one is of Mary, Joseph, and the Baby Jesus."
The Chinese man said "Oh. I thought that was Abraham, Sarah and their son Isaac."
Then the Jesuit said, "And this one is of Jesus and his twelve disciples."
The Chinese man said "Oh. I thought that was Jacob and his twelve sons."
The Jesuit asked "Who are you?"
The Chinese man replied "I may not know who I am, but you're a fake!"
And, he walked out.
According to the story, the Jesuit investigated further and wrote to Rome that he found 4 Jewish synagogues in China, populated totally by ethnically Chinese Jews...