The man spray painted the graffiti on the steps of the Blessed Sacrament School in Staten Island.
The decision by the Archdiocese of New York follows last-ditch fundraising efforts at some schools.
The 27 "at-risk" schools have until Jan. 3 to prove they can survive without subsidies or face closure.
Students and families rallied Wednesday to save two Bronx Catholic schools the archdiocese may close.
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