“After these things I saw, and, look! a great crowd, which no man was able to number, out of all nations and tribes and peoples and tongues, standing before the throne and before the Lamb, dressed in white robes; and there were palm branches in their hands.

Rev. 7:9,

Are they spiritual Israelites? Clearly they are not, since they are described as coming out of all nations, tribes, peoples and tongues, after John describes the sealing of the 144,000 members of spiritual Israel. Thus, it is evident that not all Christians today are spiritual Israelites.