 Between 1524 and 1575, the Barnabite, Jesuit, Oratorian and Theatine orders came into being, and as their influence spread, more and more new churches began being built.By 1725, there were 323 churches in Rome alone, serving a permanent population of fewer than 150,000 people.Because of this rapid growth in church building, it became the responsibility of these religious orders to spread the word of Catholicism to the population.