Two Israels? Two Kingdoms? Two Second Comings?

The teaching that there are two different called-out peoples, one spiritual and one earthly, is not found in the writings of the Apostle Paul. Paul taught clearly that there is only one holy olive tree, Israel, and we Gentiles have been grafted on it. In the last days the Jews by race will be joined once again to the Olive Tree, the true Vine, the one true stock of Abraham, which is Christ. There will be one Body, one fold, one Shepherd, one Israel, one holy nation of kings and priests.
There are not two kingdoms, a spiritual Gentile kingdom and a natural Jewish kingdom. There is only one Kingdom of God, of Heaven. It is the Kingdom announced by the Hebrew Prophets.
Of all the errors of current Christian theology, one of the most weakening and misleading, in terms of the spiritual strength and diligence of the believers, is the teaching that there will be a special, secret coming of Christ prior to His actual, prophesied coming to establish His Kingdom on the earth, a secret coming whose purpose is to carry the Gentile elect to Heaven while the Jewish elect are left on the earth.
Are there two called-out peoples, one Gentile and one Jewish?Are there two called-out peoples, one Gentile and one Jewish?