Test Proposal Opposed in Calif.California religious leaders --

Protestant, Catholic and Jewish -- are preparing to do battle with supporters of political extremist Lyndon H. LaRouche Jr. over a proposal to come before state voters this fall that would place drastic restrictions on persons suffering from AIDS.

The LaRouche-backed initiative calls for mandatory AIDS testing of persons in certain occupations. It bars from certain jobs those suffering from acquired immune deficiency syndrome and persons who test positive for the AIDS antibodies. Health experts estimate that from 20 to 40 percent of those who test positive will eventually develop the disease.

The measure also would authorize health officials to quarantine "as they deem necessary" persons with AIDS and those whose blood carries the suspect antibodies.

The California initiative is expected to draw nationwide attention, in part because it will be the first opportunity for voters anywhere to decide how far government should go in dealing with the deadly disease.

Ecumenical councils in both Southern and Northern California plan to oppose the measure, spokesmen said.

In Los Angeles, a newly organized AIDS Interfaith Council of Southern California, believed to be the first such group in the nation, has called on local churches and national religious bodies to "counter negativism" about the disease with compassion and information.

Los Angeles Archbishop Roger Mahony, cochairman of the newly formed AIDS council and head of the country's largest Catholic diocese, charged that "fear, bigotry and misinformation" surrounding the disease is "more contagious" than AIDS itself. Jewish Memorabilia Sought

Photographs, documents and other memorabilia related to the Jewish community that once centered in Southeast Washington are being sought by the Lillian and Albert Small Jewish Museum at the Jewish Community Center in Rockville for a special exhibit later this year.

Persons with items to lend may contact the Rockville center. Lutherans to Vote

The Rev. Ralph Bohlmann is facing a challenge from conservatives in the denomination as he seeks a third term as president of the Lutheran Church-Missouri Synod at the 2.6 million-member denomination's national convention, which opened yesterday in Indianapolis.

First elected in 1981 to succeed the Rev. J.A.O. Preuss, Bohlmann has been criticized for failure to discipline those in the church who favor closer ties with other Lutheran bodies.

The Lutheran Church-Missouri Synod, which split more than a decade ago as the result of sharp doctrinal differences, is the most conservative of major Lutheran bodies in this country. It has opted out of the planned 1988 merger of the American Lutheran Church, the Lutheran Church in America and the Association of Evengelical Lutheran Churches.

This year's convention also will consider 183 resolutions on a variety of issues, including one offered by the denomination's Concordia Theological Seminary in Fort Wayne, Ind., that declares the three churches involved in the merger "no longer genuine Lutheran churches from a traditional and confessional point of view."

LCMS members and officials should "avoid any actions or relationships tending to lend credibility" to the reunited churches after the 1988 merger takes place, the proposed resolution states. Reagan Policy Denounced

An Oklahoma-based television evangelist has broken ranks with fellow electronic preachers with a stinging denunciation of the Reagan administration's farm and food policy.

Larry Jones of Larry Jones International Ministries, based in Oklahoma City, has vowed to collect 1 million signatures on petitions calling on the federal government to open up reserves of stored grain for use by hungry people here and abroad.

"The 12 million bushels of grain being hoarded by Americans while the world starves is a bureaucratic mess that stinks to high heaven," said Jones, whose weekly evangelistic program is heard on 120 TV stations. Jones also heads a group called Feed the Children, an international relief organization.

He also called on churches and synagogues to buy surplus grain to feed the hungry. He said his own group has shipped 15 million pounds of surplus grain to the needy.

"While churches build bigger buildings in which to preach an Americanized success theology, the government builds bigger barns to hoard surplus food," he said. "It's like Christians and government officials have teamed up to create an international tragedy." People

A memorial service will be held at 11 a.m. today for the Rev. Joseph C. Weber at The United Church, 1920 G St. NW, where he was pastor of the German-speaking congregation. Weber, who died July 6 of cancer, was also on the faculty of Wesley Theological Seminary . . . .

Rabbi Matthew H. Simon of B'nai Israel Congregation in Rockville is the new president of the Washington Board of Rabbis . . . .

Hyveth Williams, who will become associate pastor for evangelism of Sligo Seventh-day Adventist Church in Takoma Park, is the first black woman to hold such a post in her denomination in North America.