JERUSALEM, Dec. 30— A Jewish militant who provoked rioting in Hebron and outrage in the Muslim world when she put up posters depicting the prophet Mohammed as a pig was convicted today of committing an act of racism and trying to offend religious feelings.

Standing in a white T-shirt as the verdict was pronounced at the Jerusalem District Court, Tatyana Suskin, 26, wept as the judge, Zvi Segal, read for more than an hour from his 63-page judgment.

A follower of the outlawed anti-Arab group Kach and an immigrant from the former Soviet Union, Miss Suskin was also found guilty of supporting a terrorist group and endangering life by stoning an Arab car.

She faces a maximum penalty of 26 years in prison, although sentencing was put off to a later date.

Miss Suskin was arrested in June after she plastered posters on storefronts in the Palestinian-ruled part of Hebron that depicted Mohammed as a pig stamping on a Koran.

Pigs are considered unclean by Islam, and the eating of pork is forbidden under Muslim religious law.

The incident set off days of street clashes in Hebron between Palestinian protesters and Israeli soldiers, and also enraged Muslims abroad. A man charged with killing nine German tourists in Egypt in September contended that he had been spurred to action by the posters.

Last week, two other Jewish militants of Russian origin were arrested on suspicion of planning to hurl a pig's head into the area of Islam's third holiest shrine, Al Aksa mosque in Jerusalem's Old City, during the Muslim holy month of Ramadan, which began today.

In his verdict against Miss Suskin, Mr. Segal rejected defense arguments that she was emotionally disturbed, ruling that she had acted with cool calculation, fully aware of the consequences of her acts.

''The harm caused in this case is wide and offends all members of the Islamic faith,'' the judge said.

Miss Suskin acted out of a ''patently racist motive'' and with ''clear intent'' to provoke hatred and violence, the judge asserted, adding that freedom of expression did not give her the right to put up the posters in Muslim neighborhoods of Hebron.

Miss Suskin said she was not sorry. ''I don't agree with this conviction,'' she told reporters. ''I have nothing to regret.''

She added: ''The whole legal system is one big mistake. I didn't expect anything good from this system.''

Her lawyer, Shmuel Casper, argued that her right to freedom of expression had been infringed. ''It's time this country drew up a bill of rights so people will know whether a picture they draw or a postcard they send is a racist act,'' he said. ''She didn't go there to incite World War III.''

A day after Miss Suskin put up the posters while wearing a T-shirt with the clenched-fist symbol of Kach, she hurled a stone at a car driven by a Palestinian motorist, breaking its window, according to her indictment. She was convicted today of endangering human life on the road.

Kach, which is banned in Israel, was founded by Meir Kahane, a radical anti-Arab rabbi who was assassinated in New York in 1990.

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The fact that KACH is banned while Hamas clone groups run about Israel freely is no less absurd!