Nimrod, known in Egypt as Osiris, was a significant figure in the origin of Christmas, recognized as the founder of the first world empire at Babel, later called Babylon. After his death around 2167 BC, his mother and wife, Semiramis, promoted the belief that he was a god. She claimed to have seen a full-grown evergreen tree spring from a dead stump, symbolizing new life for Osiris. On his birthday, coinciding with the winter solstice at the end of December, Semiramis said Osiris would visit the evergreen tree and leave gifts beneath it. This narrative contributed to the deceptive traditions that later blended into the celebration of Christmas, intertwining pagan rites with other cultural elements over time.

In the exploration of ancient pagan influences on modern religious festivals, Osiris emerges as one of the many names associated with Nimrod, a figure tied to sun worship. Known also as Tammuz, Adonis, Bacchus, and others, Osiris represents the deified sun god in Egyptian mythology. Ancient literature reveals that Egyptian women mourned for Osiris, paralleling similar lamentations for other sun deities across different cultures. This widespread mourning reflects a common thread of sun worship that has permeated various traditions. Furthermore, Osiris is among the sun gods, including Mithra, Horace, Hercules, Bacchus, Tammuz, and Indra, all reputedly born on December 25, a date significant in the old Roman astronomical calendar as the winter solstice, linking these ancient beliefs to the timing of Christmas celebrations.

The fish symbol, deeply rooted in ancient pagan traditions, carries significant connections to various deities, including Osiris. In one notable tale, the fish is linked to the story of Osiris, where it is said to have swallowed his sexual organ, symbolizing a connection to fertility and reproduction. Additionally, the fish was considered a representation of the sexual organ of Isis, further emphasizing its association with themes of birth and feminine sexuality in ancient mythologies.