The Qur’an describes the kind of Christians who would love the “believers” (Momin, a higher spiritual level than Muslims) … If I understand you correctly, you are not looking for a theological justification necessarily for such a proposal… I think, for Muslims, there is a Quranic basis … (there is also a basis for such with other religious groups as well… and there are basis why such a proposal would not fly – i.e. not with arrogant zionists, and/or arrogant ‘christians’ etc. )