They get money from donations and investments. The Catholic Church (for one example) gets billions of dollars from interest each year from their investments. They are tax-exempt because they are non-political and do a lot of charity and are non-profits.
Who is the leader of the Protestant Church?
Martin Luther, often called the father of Protestantism, fundamentally changed the Christian world through his force of will and new ideas. He tried passionately to reform the Catholic Church.