By the CNN staff

(CNN) - An Iranian judge has sentenced an American Christian pastor to eight years in prison after he was tried for his religious beliefs, a U.S.-based religious group said Sunday.

Saeed Abedini was swiftly sentenced by a member of the Islamic Republic's Revolutionary Court, according to the American Center for Law and Justice, an organization founded by television evangelist Pat Robertson.

CNN was not immediately able to confirm what went on in the court proceedings.

Abedini, who was born in Iran and now lives in Idaho, has been jailed in Iran since September, the group said.

"This is a real travesty - a mockery of justice," said Jordan Sekulow, executive director of the ACLJ, in a statement. "From the very beginning, Iranian authorities have lied about all aspects of this case, even releasing rumors of his expected release."

"Iran has not only abused its own laws, it has trampled on the fundamentals of human rights," added Sekulow, who represents Abedini's wife and children, who are in the U.S. "We call on the citizens of the world to rise up in protest. We call on governments around the world to stand and defend Pastor Saeed."

Abedini's trial began Monday when he and his attorney appeared in a Revolutionary Guard Court to address charges of attempting to undermine the Iranian government, the center said. His attorney apparently was shut out of some proceedings.

"We condemn Iran's continued violation of the universal right of freedom of religion and we call on the Iranian authorities to respect Mr. Abedini's human rights and release him," U.S. State Department spokesman Darby Holladay said in written statement.

The group contends that charges stem from Abedini's conversion to Christianity from Islam 13 years ago and his activities with home churches in Iran.

On Monday, the pastor gave the judge a written statement and was questioned by prosecutors and his defense lawyer, whom he met for the first time that day.

The judge in the case has faced sanctions by the European Union "because of his harsh sentences for those on trial for exercising a fundamental human right," the center said.

Naghmeh Abedini, the pastor's wife, said last week that a few laymen with the Christian church in Iran told her husband's attorney that they had been called to testify in the case.

She said that when she last spoke with her husband on January 9, he was resigned to a fate of remaining in prison.

The Iranian state-run news agency ISNA reported Monday that the pastor would soon be released on bail - which Naghmeh Abedini charged Tuesday was "clearly a lie."

Saeed Abedini has been arrested nearly 10 times in the past by the Iranian authorities, his wife said. The last time he had been held was in 2009, when he agreed to stop supporting home churches. He has taken nine trips to Iran, where he was born and where his parents live, since then.

His wife said he felt that it was safe to go back repeatedly because he had had no dealings with the authorities since he promised to stop working with Christian home services.

Once he even went with his wife and two children. He and Naghmeh are both converts to Christianity from Islam, and they received threats during the most recent family visit, so she took the children home. He returned to their home in Boise, Idaho, later.

Last summer, the pastor was on a bus that was crossing from Turkey into Iran. Immigration officials took away his passport and he was later put under house arrest. In September he was jailed, in the notorious Evin prison, while he awaited trial.