The Unification Church has promised the American Jewish Congress that the church will respond to any inquiries from parents concerning children who are in the movement.

The agreement was negotiated by the Jewish agency's special department, set up nearly a year ago, to moniter the activities of religious cults in this country.

The agreement "could be quite a thing if they (the Unification Church) live up to it," observed Harold Becker, national chairman for the congress's office on cults.

Nathan Z. Dershowitz, director of the agency's Commission on Law, Social Action and Urban Affairs, said "there is a tremendous concern in the Jewish community as well as other communities about the effects of cult involvement on parent-child relationships."

A common complaint of parents whose children have become involved with the cults is the difficulty of maintaining contact with them as they move about the country.

Other parents, particularly in cases where they have had confrontations with cults, have complained that the group, fearing possible kidnapping and deprogramming attempts, have declined to give them any information about their children's whereabouts.

Becker stressed that the congress's office on cults were focused primarily on information and education and disavows such tactics as deprogramming and "all illegal activities."

Though the office was created in response to complaints registered by Jewish parents, the agency does not restrict its services to a Jewish constituency. Inquiries may be addressed to Julius Schatz at the congress's New York offices, 15 E. 84th St.