The First Omen will seek to take The Omen franchise to uncharted territory after a slew of disappointing sequels and a poorly-received remake, and to do it effectively it's changing the weirdest element of the franchise's canon. The backwards trailer for The First Omen provided an unsettling look at the franchise's first entry in more than a decade, and it looks poised to capture much of the creepiness that defined the original 1976 classic. While the sequels expand upon the original movie's diabolical premise, the prequel will return to the origin of the evil child at the center of the franchise.

https://screenrant.com/first-omen-prequel-damien-birth-nun-satan-jackal-canon-change/