The gospel Jesus brought to mankind is simply the "good news" of the Kingdom of God—and that Kingdom is dual. It is not only the ruling government which Christ will establish on the earth when He returns, but it is also the Family of God—the God Kingdom composed of the spirit members of the God Family.
And, incredible as it may sound, Jesus taught that humans can be "born" into the Family, or Kingdom, of God.
There are only two members in the God Family or Kingdom at the present time—God the Father and Jesus Christ the Son. But God is increasing His Family, and you can be "born" into it!