"A microcosm of the church"?

Denny Burk has linked to the sermon to which Al Mohler refers in his latest article.
In the sermon, Stanley told the story of a husband who left his wife for another man. At the end of the story, the wife, her new boyfriend, their children, and the new homosexual couple all end up attending a Christmas service together. Stanley looks at them sitting together and celebrates them as a “microcosm of the church.”