Unsettling and shocking, this is a prominent horror As a prequel to The Omen that doesn't have notable sequels, The First Omen came as surprise, knowing how underdeveloped Hollywood horror prequels are. This movie knows what it wants, hugely inspired by 70's horror aesthetics (the moving zoom-in, relying on unsettling ambiences, etc.) create an amazing experience from the beginning to the end.
Much like its original work, The First Omen doesn't shy from graphic violence and jumpscares, but Stevenson as the director, knows how to use them effectively in order to thicken the mystery as the main plot. But, that's not what makes this movie amazing. The climax is a top-tier climax I've ever watch in a horror film. It's graphic, sadist, surreal, and horrifying, which I won't forget quickly. The climax also gives enough answer, but also enough unanswered questions that open for future sequel.
What keeps me from giving this film a perfect score is due to its slow pacing in the first act, which somehow disjoint the movie's pacing throughout the movie. But still, it's my personal favorite horror, even movie, of the year.