"Christmas is much more important than a headmaster being provocative," Renzi told today's edition of Corriere della Sera.
"If he thinks he is promoting integration and co-existence in this way, he appears to me to have made a very big mistake."
Marco Parma, 63, sparked protests from some parents and a media outcry by deciding to postpone the annual Christmas concert for primary school pupils to January and rebrand it a "winter concert" which will not feature any religious songs.
"In a multi-ethnic environment, it causes problems," Parma said, saying his decisions had been influenced by an unhappy experience last year.
"Last year we had a Christmas concert and some parents insisted on having carols. The Muslim children didn't sing, they just stood there, absolutely rigid.
"It is not nice watching a child not singing, or worse, being called down from the stage by their parents."
The school, which has primary and middle school sections, has a roll of around 1,000 pupils with an estimated one in five of non-Christian faiths, primarily Islam.
Parma said he is prepared to resign rather than back down and insisted he has the backing of the school's teachers following much discussion of how to handle the sensitive issue.
The head denied press reports that he had banned crucifixes from classrooms.
Catholicism has not been Italy's state religion since 1984. But a law dating from Fascist dictator Benito Mussolini's reign requiring the presence of crucifixes in schools has never been revoked.
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