(Reuters) - The Vatican has cracked down on a prominent Austrian Roman Catholic priest who has been leading a disobedience campaign to openly challenge Roman Catholic teachings on celibacy and women priests.

The Vatican said on Thursday it had stripped Father Helmut Schueller of the right to use title monsignor and said he also was no longer a "Chaplain of His Holiness". Schueller remains a priest.

Schueller, a former deputy to Vienna's archbishop, Cardinal Christoph Schoenborn, had been given the honorary title in his capacity as head of the Austrian branch of the Catholic charity group Caritas.

Schueller is head of the group "Call to Disobedience", which has broad public backing in opinion polls and says it represents about 10 percent of the Austrian clergy.

Nearly 150,000 Austrians left the Church in 2011-2012, many in reaction to sexual abuse scandals.

The group wants Church rules changed so that priests can marry and women can become priests. It has said it will break Church rules by giving communion to Protestants and divorced Catholics who remarry.

Schueller told Austrian media that the Vatican decision had not shaken his principles.

Reformist Austrian Cath...

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