Astral religion is not one tradition borrowing from another. It is the same pattern arising independently, again and again, in societies with no contact, because the sky is the one shared observable fact every human civilization has always had. Mesopotamian state religion built a whole calendar and omen system around identifying Ishtar with Venus, Shamash with the sun and Sin with the moon, and its royal court kept astronomers whose readings of the sky shaped policy. Egyptian religion tied the star Sopdet, our Sirius, to Isis, and its heliacal rising after seventy days of invisibility announced the Nile flood that made Egyptian civilization possible in the first place.
Across the Atlantic and unconnected to either, Mesoamerican societies built the Dresden Codex's Venus table to track that planet's cycle with real precision and to time ritual warfare to it. In Britain and Ireland, megalith builders aligned monuments to solstice sunrise centuries before writing existed in that region. In China, court astronomers read comets and eclipses as evidence for or against a ruling dynasty's Mandate of Heaven. Aboriginal Australian traditions carry the night sky as ancestral narrative, and Polynesian navigators used the same stars as a working instrument to cross open ocean deliberately, not by accident.
None of these traditions taught each other this. The film Zeitgeist's specific claim, that particular myths were literally copied between traditions, fails point by point against primary sources. The deeper pattern it gestures at, that humanity has always built religion around the sky, is real, well documented, and far more interesting than any borrowed story.