A hateful lunatic barged into a Manhattan synagogue on Friday evening, assaulting a congregant and headbutting a security guard in a deranged antisemitic attack, police said.

Larry Montes, 46, allegedly launched the unhinged attack at Central Synagogue on Lexington Avenue and East 55th Street during Shabbat services, according to police and sources.

He walked to the front of the synagogue around 6 p.m. and began acting disorderly, law enforcement sources said.

Security stepped in and began to escort the man outside — but not before he allegedly slugged a 63-year-old congregant in the face, the sources said.

Montes also allegedly headbutted and…

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