Jewish Comedians

There was a get-together in New York recently of "Old Jewish Comedians". Everyone had a joke or funny story to tell.
"Larry Gelbert says of us that we are so old that the first cruise some of us worked on was The Ark."
"We were so poor, we slept five kids in a bed. That's how we invented the water bed. I never got to sleep alone until I got married."
"A woman who went to a palm reader heard 'Your husband is going to die a violent death'. She asked: 'Will I be aquitted?' "
Why are/were there so many Jewish comedians? Especially in America. Why aren't there any Muslim comedians?
A couple of years before Larry Adler died he sent a letter to a newspaper asking if there was such a thing as a Muslim joke.
No one replied.