As I Understand It (Scripture Study)
Matthew 13:33 (NIRV) 33 Jesus told them still another story. "The kingdom of heaven is like yeast," he said. "A woman mixed it into a large amount of flour. The yeast worked its way all through the dough."
This is one of the stories Jesus told to explain the kingdom of heaven. It starts small and overpowers everything else throughout the world. This is the model for the kingdom of heaven, God's rule over people, both in this life and the one to come. If one is submitted to God, that person is part of the kingdom of heaven.
What is the yeast? Verses 31 and 32 tell us: 31 Jesus told the crowd another story. He said, "The kingdom of heaven is like a mustard seed. Someone took the seed and planted it in a field. 32 It is the smallest of all your seeds. But when it grows, it is the largest of all garden plants. It becomes a tree. Birds come and rest in its branches."
The yeast like the mustard seed represent represent that small something that grows exponentially within a larger body, having the power to change the larger body by its existence. That something might be called the call of God on an individual or group of people . It might be called the Holy Spirit working within such people. If this something is there it changes the larger body.
America is not a Christian nation and may never have been one. But it has always had a number of vocal Christian sympathizers and Christians and those adept at usurping any cause, movement or belief by any means possible for their purposes. And the masses who rely on leaders to lead them have always believed without personal inspection and followed.
Politicians and Christian leaders have counted on our allegiance and advanced by keeping before us the pretense that they have counseled with God, know His mind and now would have us go in a particular direction pleasing to Him.
But from time to time a real mustard seed is planted and real yeast is mixed into the flour and there is no taint by Christian leader or politician and there is exponential growth toward God's purpose as we become God's people.