The gospel of St Matthew opens the New Testament with a frightening visit from a skyborne being who descends from the starry heavens to proclaim a sensational message to terrified shepherds attending their flocks:-
Let's say that the creator of our universe ( the metaphoric god) is a planet or a first universe. After the creation of man on the earth he decides man needs some direction and sends over a human projection of himself at the speed of light to artificially inseminate a women of good morals(Mary). The son is born does a world of good and then sacrafices himself. He disappears after the body is put in the cave by coverting into light and traveling back to the creation part of the universe (heaven).
Could Jesus be an alien?