Aslam

Praise be to Allah.It

is not permissible to bury a kaafir in the Muslim graveyard, regardless of

whether he was adopted by a Muslim or not, or whether he had reached the

age of adolescence or not. But if there was any indication that he was

Muslim (or that he had become Muslim), then he may be buried in the Muslim

graveyard. It should also be noted that adoption [in the sense that the

child is given the name of the person who adopts him] is forbidden in

Islam, because Allaah says (interpretation of the meaning):

“Call

them (adopted sons) by (the names of) their fathers.” [al-Ahzaab 33:5]

And

Allaah is the Source of strength. May Allaah bless our Prophet Muhammad

and his family and companions, and grant them peace.