Do you have a breakdown of HOW MANY of those 50,000 Christians were driven out by Jews, and how many by Moslems?

I haven't seen a breakdown of the numbers, but according to the following, most of the Christian Palestinian who were made refugees as a result of the 1948 expulsion of Palestinians from their homes and villages ended up in the same camps as the Muslim Palestinians. In the case of those Palestinians, the expulsions were clearly the work of Zionists, and not Muslims.

"A majority of fifty-six percent of Palestinian Christians are found outside of their country. This situation of out-migration resulted from the exodus of 726,000 Palestinian refugees in the 1948 Arab-Israeli war. Fifty to sixty thousand Palestinian Christians, comprising 35 percent of all Christians in pre1948 mandatory Palestine, were among the refugees'. In 1996, these refugees and their descendants are spread over the entire Middle East but primarily in the sixty refugee camps dotting the topography of the West Bank (19 refugee camps); Gaza Strip (8 refugee camps); Jordan (10 refugee camps); Syria (10 refugee camps) and Lebanon (13 refugee camps)."

More on the religion of the Tamils...

"Ceylon became a British colony in 1796. But long before the British arrived, the country consisted of two separate cultures, each with its own language, religion, and customs. The majority is composed of Sinhalese, who live in the west, south, and center of the island. Their name means "of the lions," and they are primarily Buddhist.

Tamils (primarily Hindu) make up a smaller portion of the population, and have traditionally lived in the east and north. Many Tamils from India were relocated into Sinhalese areas by the British during the early 19th century, nearly doubling the number of Tamils on the island. They were employed as cheap laborers on the tea plantations. At the time of independence, there were about 4.6 million Sinhalese and 1.5 million Tamils."

http://www.nationalreview.com/kopel/kopel_gallant_eisen200403030918.asp