VATICAN CITY - In the Catholic Church, it's true that everything old can be new again, and the Vatican wants one of those things to be the art of "apologetics" — dusted off and updated to respond to new challenges, including those posed by militant atheists.

The term "apologetics" literally means "to answer, account for or defend," and through the 1950s even Catholic high school students were given specific training in responding to questions about Catholicism and challenges to Church teaching.

At least in Northern Europe and North America, the effort mainly was a response to Protestantism. Today, while sects and fundamentalist groups challenge Catholics in many parts of the world, almost all Catholics face objections to the idea of belief in general, said Legionary of Christ Father Thomas Williams, a professor at Rome's Pontifical Regina Apostolorum University.