An internal study circulated within the Polish government says that after nearly four years in power, Gen. Wojciech Jaruzelski's rule suffers from poor credibility and an image of ineptness in the eyes of the public, a lack of clarity in its policies and political "dangers" from virtually every sector of Polish society.

The study contends that organized opposition by the outlawed Solidarity union and other groups is weakening and that Solidarity is now "fighting for its existence," although it still poses myriad threats to the communist rulers.

But the report portrays the Roman Catholic Church and Poland's independent-minded artistic and academic communities as riddled with committed opponents of the regime who are fomenting "ideological and political chaos." It says that church-state relations should be "reassessed" and calls for the use of financial pressures on Polish intellectuals to compel obedience.

In addition, both the new official unions and a broad-based political organization called PRON, set up by the government in 1981 as a channel of communication between the state and society, are said to be in danger of stagnation, as neither the public nor large elements of the state bureaucracy take them sufficiently seriously.

The 25-page report, titled "Dangers in the Social-Political Sphere in 1985," was stamped "Confidential" and issued in numbered copies for discussion at the March 22 meeting of the Council of Ministers, the Polish cabinet. A copy was obtained by the Los Angeles Times.

The report enumerates a discouraging list of perceived threats to the leadership's efforts to expand its influence over Polish society -- from wayward youth and resentful workers to anticommunist clerics and intellectuals to subversive foreign radio stations that feed the nation's discontent. Not least among the government's problems, the report says, is a lack of clarity, and sometimes reality, in its own pronouncements.

Singling out credibility as the government's major stumbling block, the report blames the "insufficient growth of confidence in the regime and its credibility" on what it calls the "relatively low . . . effectiveness with which voiced declarations are implemented."

The authors were not identified, nor was it known whether the Council of Ministers will use it as a basis for action. Given the level at which it was reviewed, however, the report appears likely to have broad influence.

The study suggests a deep sense of insecurity that seems at times to verge on absurdity. In listing social threats to youth and educational institutions, the report lumps drug addiction with "free summer camps for children" sponsored by the Roman Catholic Church, and it alleges that the church is engaged in a campaign to "take over the minds of the society, especially its youth."

The church is accused of conducting "ideological infiltration of the scout movement" while trying to expand its influence in schools, factories, health and recreational facilities. Solidarity, meanwhile, is said to be continuing its efforts to infiltrate the official unions, cultural groups, universities, factory self-management units and the church.

The report also stresses the need for dealing openly and honestly with the public on the country's serious economic and social problems, "through dialogue that is real, not sham."

It offers few concrete prescriptions, except in regard to the two sectors of society seen as posing the greatest resistance -- intellectuals and the church.

The Roman Catholic episcopate is accused of seeking to assume the "role of an important political force in Poland . . . and warrantor of its future." The report outlines no specific actions against the church but recommends that the "state of implementation of policy toward the church, and of church-state relations, should be reassessed."

Coming shortly before a plenum of the party Central Committee set for later this month, which is to deal with issues of the intelligentsia, the report indicates that the government contemplates rolling back the measure of freedom universities and research institutes gained during the Solidarity era in 1980-81.

The report says the most pressing political challenge is posed by the fall legislative elections.

Only state-approved candidates may run, but the government counts on a large turnout as a demonstration of its acceptance. As things stand, this is by no means assured.