The Christian Church is NOT the object of the prophecies over Israel in the Old Testament. See Isaiah 62:4, for example. There is no reasonable way to apply that to the Church. The Church is not and never will be Israel.

However, many individuals within the Christian Church ARE Israel, even if they don't know it. Many who claim to be Israel are not, and many who don't even understand what Israel is, are, in fact, Israelites.