The 190th United Presbyterian General Assembly has elected a San Antonio clergyman, Rev. William P. Lytle, 54, as presiding officer of the 2.6 million-member church.

In another action, a proposal that must be ratified by the church's 153 presbyteries would require churches to allow baptized children to receive communion if their families request it.

The sacrament may be administered by lay persons alone in certain circumstances. At present, governing bodies of individual churches may decide whether baptized children not yet church members are permitted to receive communion.

The National Council of Churches adopted a resolution earlier this month expressing concern about the resurgence of Nazism and the Ku Klux Klan in the United States.

The resolution criticizes the klan's "reliance on tactics of falsehood, intimidation, terror and violence in the guise of patriotism" and calls on church members to oppose "the evils of the Ku Klux Klan."

The resolution on Nazism expresses "concern about the recurring signs of Nazism evidenced in the recent demonstrations by the National Socialist White People's Party in St. Louis and Nazi march planned in Skokie, III." It asked churches to be alert and resist "the implicit and explicit advocacy of Nazi ideology by various groups and persons" in the United States.

The Rev. John Steinbruck, pastor of Luthther Place Memorial Church at 1226 Vermont Ave. NW. has received a letter from President Carter repudiating the "unjust accusation " that Jews are collectively responsible for Jesus' death.

Steinbruck had written to Carter expressing "uneasy concern" about remarks Carter reportedly made last spring to his Bible class at the First Baptist Church of the City of Washington, D.C., at 16th and O Streets NW.

Steinbruck wrote that "many Jews and Christians are concerned that press accounts of remarks about the killing of Jesus attributed to you. . .will undermine progress that has been made in the Christian world removing the basis of deicide charges against the Jewish People."

Carter's reply, dated six days later, said he wanted to "set forth my personal position and . . . clarify any misunderstandings which may have resulted from these incomplete accounts." Carter said he supports a 1972 Southern Baptist Convention resolution declaring "antisemitism as un-Christian."

The Baltimore Hebrew College will join the Community College of Baltimore in offering a four-year academic program combining business courses with Jewish studies.

Students will spend two or three days a week at each school. "We're offering a degree which not only has the intrinsic human interest of Jewish subjects but also the kind of career oriented program that is so attractive," said Dr. Jerome Gillison, dean of undergraduate studies at the Hebrew College.

In a separate arrangement, the Hebrew College will offer two college courses at the Meeting House in Columbia. Beginning in September. "Issues in Jewish Law," and "World of Our Fathers," a course about Jews of Eastern Europe will be offered.

Richard Wayne Dirksen has been appointed organist and choirmaster of Washington Cathedral. Dirksen a graduate of Baltimore's Peabody Conservatory of Music in 1942, has been with the cathedral in various positions since that time. He replaces Paul Callaway, who retired last year.