Israel could have had that Kingdom setting beginning in the days of the Apostles, and Peter had the keys to administer entrance into it, but the leadership of Israel, both in the land of Israel, and the Dispersion (Acts ch. 28) rejected it . . .
. . . thus it is in abeyance until the return of Christ.
I would agree to that to a certain extent. Ultimately we can't know or judge who is a member of God's church...who has the spirit of God. We're not capable and Christ made this clear in the parable of the wheat and tare. However we can band together with others of like minds in organizations to combine resources to fulfill the commission that Christ gave his disciples. Under those circumstances we make the good faith assumption that we've banded together with fellow Christians and we make that discernment based on the spiritual fruits we perceive and the love we show to one another.