As usual, you don't know what you're talking about. In 1947, the UN partitioned Palestine into two states, one Jewish, one Arab. The entire West Bank, Gaza and a third of pre-1967 Israel were given to the Palestinians for a state. What was given to the Jews were small pieces of land which they had purchased and in which they were the majority of the population.
If the Arab world had accepted the partition, there would have been no wars, no "refugees" and the Palestinians would have been living peacefully in their own independent state. Instead, they launched a war of annihilation. That is what caused the Palestinians to flee the land.
Incidentally, the same number of Jews were forced out of Arab/Islamic lands.