The Omen is a 1976 supernatural horror film directed by Richard Donner and written by David Seltzer. An international co-production of the United Kingdom and the United States, it stars Gregory Peck, Lee Remick, David Warner, Harvey Spencer Stephens (in his film debut), Billie Whitelaw, Patrick Troughton, Martin Benson, and Leo McKern. The film’s plot follows Damien Thorn, a young child replaced at birth by his father, unbeknownst to his wife, after their biological child dies shortly after birth. As a series of mysterious events and violent deaths occur around the family and Damien enters childhood, they come to learn he is in fact the prophesied Antichrist.

https://en.wikipedia.org/wiki/The_Omen

Trivia contest with no prize for the winner:

Can you name the authors inspired to write a parody of this movie a few years after its release?