Praise be to Allah.
It is not permissible to hand over Muslim orphans to the non-Muslims, Christians or others, because of the great danger that this poses to the orphans, and because they will not be given an Islamic upbringing. They (orphans) are a trust (amaanah) for which the Muslims are responsible, so it is not permissible to place them under the guardianship of anyone else. Allaah says (interpretation of the meaning):
“The believers, men and women, are Awliyaa’ (helpers, supporters, friends, protectors) of one another” [al-Tawbah 9:71]
“And those who disbelieve are allies of one another, (and) if you (Muslims of the whole world collectively) do not do so [i.e. become allies, as one united block under one Khaleefah (a chief Muslim ruler for the whole Muslim world) to make victorious Allaah’s religion of Islamic Monotheism], there will be Fitnah (wars, battles, polytheism) and oppression on the earth, and a great mischief and corruption (appearance of polytheism).” [al-Anfaal 8:73]