Let them have the doll.
I cant see it selling well, however... I cant help to think it would be any more appealing to a Muslim child than Nun Barbie or Rabbi Ken would be to a Christian or Jewish Child.
Dress up Nun Barbie in her single outfit! Nun Barbie's knees bend so she can pray - Yeah! "I dont wanna grow up, cause if I did...!"
New Rabbi Ken! Comes complete with dradle and circumscision kit! Spin your way into new money as a foreskin removal tycoon - this is fun, Mom! "OW!" "... I wouldnt be a Toys R Us kid!"