Eru's origins would be a theological question most of all.
As such, I do not see why Eru needs to have anything to do with Sagas. Tolkien was an intelligent man, not everything he ever wrote needs to be based on them. The counterparts of mythological gods would be the Valar anyway, and their creation is explained.
And Tolkien devoted ample space and writing to the creation of the sun and the moon, in various and later radically new conceptions.
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