According to the game's director, Christianity exists in the God of War universe. From its humble beginnings in 2005, the God of War series has defined itself with bombastic combat and deep storytelling. The story of Kratos, the Ghost of Sparta, has all the makings of an ideal Greek tragedy, with his feud towards the Gods of Olympus ultimately leading to the downfall of the entire Greek pantheon. Across three main titles, a prequel, and two handheld entries, the God of War saga quickly became one of PlayStation's most beloved franchises.
In 2018, the series was revived with a new title, simply titled God of War, which took the action to the realm of Norse Mythology. This new game featured an older Kratos struggling to raise his son, Atreus, while keeping his bloody past from bubbling up to the surface once more. The series has earned praise from scholars for introducing new audiences to the rich history of Greek and Norse mythology, with the games' depictions of Gods and creatures showcasing a strong degree of accuracy towards their original mythic depictions.
On Twitter, God of War director Cory Barlog was asked whether Christianity exists in the God of War universe, to which the developer replied, "It's part of the world, yes." This could have interesting implications for the series moving forward, but longtime followers of the series have always known that Christianity was always going to play some part in God of War, eventually. In 2007's God of War II, three murals can be found in the Temple of Fates, depicting prophecies seen by the Sisters of Fate. The first two pertain to the immediate events of God of War II and III, but the third depicts a trio of travelers, "heading to an unknown destiny." However, the imagery on display, with the robed figures following a star in the sky, makes it clear that the scene depicted is of the Three Wise Men following a star to the birth of Jesus Christ, as depicted in Christian mythology.
Originally, God of War's creator David Jaffe intended for God of War III to feature Kratos teaming up with the other Gods of War from Norse and Egyptian mythologies, who would be the last remnants of the old Gods on their way to the birth of a new religion. However, with both Jaffe and God of War II director Cory Barlog exiting the series following the release of the sequel, God of War III went in a different direction under the guiding hand of Stig Asmussen, and the Christian foreshadowing was dropped.
For the 2018 revival, Cory Barlog returned to the director's position. The subsequent game was met with universal acclaim, becoming one of the PlayStation 4's biggest hits. With Barlog's Tweet about the status of Christianity in God of War, it wouldn't be surprising to see more elements from Christianity or other modern religions find their way into upcoming games in the God of War series. Of course, more excitable practitioners of modern religions tend to get worked up into a fit when their beliefs are depicted in various works of art, but that potential upcoming controversy can be saved for another day.
Source: Cory Barlog/Twitter