Any list of this sort must, of necessity, be subjective in nature. However, a good argument can be made for each of these ten.
* Pope John Paul II is a no-brainer. Regardless of your faith tradition (or none at all) he is on any reasonable list of "most influentials" -- religious or secular.
* Pope John XXIII called the Second Vatican Council.
* Mother Teresa is again a no-brainer.
*Oscar Romero, the martyr of Central America and voice of the poor.
* Dorothy Day, founder of the "Catholic Worker" movement.
* Fulton Sheen made with Faith accessible through radio and TV.
* John F. Kennedy was the 1st Catholic President of the United States.
* Mother Angelica founded the first major Catholic TV network.
* G.K. Chesterton was a journalist and author par excellence.
* Richard John Neuhaus was a prominent convert from Lutheranism and a strong proponent of the role of religion in the public square.