Narrated Abu Hurairah (Radi Allahu anhu): The prophet (Sallallahu alaihi wasallam) said, "Every child is born on Al-Fitrah (true faith of Islamic monotheism) (I.e. to worship none but Allah Alone), but his parents convert him to Judaism or Christianity or Magianism,as an animal gives birth to a perfect baby animal. Do you find it mutilated?" (Sahih Al-Bukhari, vol.2,Hadith no.467)