The oldest named deity from a textual source that I know is is Inana, a Sumerian goddess of fertility and war. We have a pictographic symbol of her that dates from 3200 BC which would come to be the basis for her cuneiform name during the Jamdet Nasr period.
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.