It is narrated from Hazrat Abu Hurairah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Every child is born upon the natural disposition (fitrah), then his parents make him a Jew or a Christian. Its example is like the animal born among you—do you find any defect in it? Later, you yourselves cut its nose. A man asked: Where will these children be? The Prophet (peace and blessings be upon him) said: Allah knows best what they would have done when they grew up.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 8562