We didn't all come from Sirius
But some of us did - hence the honouring of Sirius in the story of the birth of the God Child
Star = Sirius
three kings of
On 25th December, right after sunset, the three stars of Orion's belt rise in the east as if to 'herald' the coming of the birth-star Sirius, which follows about one hour after. Such a powerful celestial sign, which in Egypt was known to denote the 'birth of the divine child' since time immemorial, was undoubtedly known to the writer of the 'Matthew' Gospel.
"Osiris's coming was announced by Three Wise Men: the three stars Mintaka, Anilam, and Alnitak in the belt of Orion, which point directly to Osiris's star in the east, Sirius (Sothis), significator of his birth..."
It seems evident that, the Graeco-Roman world would benefit greatly by absorbing the older and very powerful mythology of Isis and her star, Sirius.- by the introduction of a new divine child (Isa, Yesua - later called Jesus), born from the Madonna (Mary) in Egypt.
Thus Isis and the child Horus were metamorphosed into the Madonna and child Jesus, and the star Sirius became the 'Star of the East' which the wise men saw as heralding the birth of Jesus. Much later, three wise men became known as the 'three kings' in Western tradition and, in keeping with stellar symbolism, they also became identified to the three stars of Orion's belt. In his book Star Names: Their Lore and Meaning, the astronomer Richard H. Allen states that in European folklore the three stars in Orion's belt are often called the Magi or the Three Kings. And the Christian mythologist, Alvin Boyd Kuhn wrote:
There is the legend of the 'Three Kings of the Orient' who came on Christmas to adorn the new-born God. (bright star) The Three Kings were the three conspicuous stars in the belt of Orion that so easily distinguishes this notable constellation and their title was from days of old the Three Kings of Orion. They point almost in a direct line to the following star Sirius, which being the brightest star in the sky was seen as an archetype of the Christ-soul in mankind.
Adapted from "The Madonna and Child" by Robert Bauval