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The Supreme Court said Tuesday it will decide whether the Pledge of Allegiance recited by generations of American schoolchildren is an unconstitutional blending of church and state.

The case sets up an emotional showdown over God in the public schools and in public life. It will settle whether the phrase "one nation under God" will remain a part of the patriotic oath as it is recited in most classrooms.

The court will hear the case sometime next year.

The justices agreed to hear an appeal involving a California atheist whose 9-year-old daughter, like most elementary school children, hears the Pledge of Allegiance (search) recited daily.

A national uproar followed a federal appeals court ruling last year that the reference to God made the pledge unconstitutional in public schools.

That ruling, if allowed to stand, would strip the reference from the version of the pledge recited by about 9.6 million schoolchildren in California and other western states.

The First Amendment (search) guarantees that government will not "establish" religion, wording that has come to mean a general ban on overt government sponsorship of religion in public schools and elsewhere.

The Supreme Court has already said that schoolchildren cannot be required to recite the oath that begins, "I pledge allegiance to the flag of the United States of America,"

The court has also repeatedly barred school-sponsored prayer from classrooms, playing fields and school ceremonies.

The 9th U.S. Circuit Court of Appeals (search) said the language of the First Amendment and the Supreme Court's precedents make clear that tax-supported schools cannot lend their imprimatur to a declaration of fealty to "one nation under God."

• Raw Data: 9th Circuit Opinion (pdf)

The administration, the girl's school and atheist Michael Newdow all asked the Supreme Court to get involved in the case.

The court, however, agreed only to hear the appeal from the school district. The administration will be able to weigh in separately. The court also said it will consider whether Newdow had the proper legal footing to bring the case.

In its legal filings so far, the administration has argued that the reference to God in the pledge is more about ceremony and history than about religion.

The reference is an "official acknowledgment of our nation's religious heritage," similar to the "In God We Trust" stamped on coins and bills, Solicitor general Theodore Olson told the court. It is far-fetched to say such references post a real danger of imposing state-sponsored religion, Olson wrote.

Moreover, being a parent of a child in public school does not give a parent the power to dictate what the child will be exposed to, Olson said.

"Public schools routinely instruct students about evolution, war and other matters with which some parent may disagree on religious, political or moral grounds," he said in his appeal.

The administration also claimed that Newdow cannot sue on behalf of his daughter because he does not have custody of her. Newdow and the child's mother, Sandra Banning, have waged a long and bitter custody battle over the child, who lives with her mother. Newdow claims a judge recently gave him joint custody of the girl, whose name is not part of the legal papers filed with the Supreme Court.

To complicate matters, Banning has told the court she has no objection to the pledge.

Newdow holds medical and legal degrees, and says he is an ordained minister. He is representing himself in filings at the high court, and has said he will argue his case in person.

"Those who deny the existence of a supreme being have been turned into second class citizens by a government that continuously sends messages that 'real Americans' believe in God," Newdow told the justices in his appeal.

Newdow sued the school, Congress, President Bush and others to eliminate the words "under God." He asked for no damages.

The phrase "under God" was not part of the original pledge adopted by Congress as a patriotic tribute in 1942, at the height of World War II. Congress inserted the phrase more than a decade later, in 1954, when the world had moved from hot war to cold.

Supporters of the new wording said it would set the United States apart from godless communism.

The case is Elk Grove Unified School District v. Newdow, 02-1624