That was only the beginning. In the hands of missionaries like the Apostle Paul, the gospel soon surged out of its Jewish birthplace. A missionary recently witnessed the same explosive phenomenon in an unevangelized region of Asia.
Similar reports come from almost every region of the world.
A phenomenon called church-planting movements. They increase exponentially, since new churches quickly plant churches themselves. They emerge from prayer and build their foundations upon the Word of God. They also thrive with lay leaders and don't depend upon professional clergy or buildings for growth. The end of all our efforts is for God to be glorified.