Islamic ruling on placing Islamic projects in the hands of non-Muslims
Question

                What is the Islamic ruling on doing Islamic projects through Jewish or Christian missionary groups?
Praise be to Allah.It is not permissible to hand over Islamic works such as those mentioned 
          to kaafir workers, because they cannot be trusted and we cannot be sure 
          that they are sincere. Allaah says (interpretation of the meaning);  
          
“Indeed there has been an excellent 
          example for you in Ibraaheem (Abraham) and those with him, when they 
          said to their people: ‘Verily, we are free from you and whatever you 
          worship besides Allaah, we have rejected you, and there has started 
          between us and you, hostility and hatred for ever until you believe 
          in Allaah Alone’” [al-Mumtahanah 60:4]  
          
“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 Islâmic 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] 
The Council of Major Scholars in the Kingdom of Saudi Arabia 
          has issued a statement that it is forbidden to delegate the building 
          of mosques to non-Muslims, because of the evidence (daleel) and reasons 
          referred to above.