Man burns 3 day child to death on a bone fire after a cult leader ask him to.

A tiny baby was burned to death on a bonfire after a cult leader declared the child to be the Antichrist, police said.

The baby, just 3 days old, was strapped without any clothing to a board and tossed onto the blaze because “the end of the world was near.”

The horrific ritual allegedly happened in a house in Colliguay, near the Chilean coastal resort of Valparaiso, last Nov. 12.

The baby’s mom, 25-year-old Natalia Guerra, allegedly gave permission for the brutal murder to go ahead.

Cops have arrested four people — from a 12-member sect led by Ramon Gustavo Castillo Gaete — in connection with the death.

The Police Investigative Unit’s Miguel Ampuero said Gaete, 36, formed the cult — which consisted of professionals including a filmmaker, a veterinarian and a flight attendant — in 2005.

He was last seen traveling to Peru to buy ayahuasca, a hallucinogenic brew plant he reportedly used to control his disciples.

Reports suggest he could be trying to set up a similar sect in the neighboring South American country.

Guerra remains in custody charged with murder, alongside Josefina López, Carolina Vargas San Martín and Pablo Undurraga Atria, reports La Nacion.