I do not know what and where have you read anything. But Rta existed even before Gods. RigVeda says it very clearly.
"The Gods are later than this world's production. Who knows then whence it first came into being?"
Rig Veda: Rig-Veda, Book 10: HYMN CXXIX. Creation.
From my reading of those passages, I see those passages talk of the One God and the Mystery of Creation, that man has made the many God's
Luckily, Baha'u'llah has explained the mystery of creation in great detail, detail that is in compliance with science.
The explanation of the questions your quoted Passage asks have now been given, and the closing passage is the possible key;
"... Who knows then whence it first came into being?
7 He, the first origin of this creation, whether he formed it all or did not form it,
Whose eye controls this world in highest heaven, he verily knows it, or perhaps he knows not..."
I see this talks of the One God, but who has that Knowledge of God and Creation? We now know that the Messengers have and can give us that knowledge.
This is the opening paragraph of the 'Tablet of the Universe', to me it explains a few of the questions asked in the passage you offered
"... Praise be to God Who hath ever caused His Names and Attributes to penetrate the degrees of existence; Who hath made the effects of those Names and Attributes to shine resplendent and their signs to be firmly established in both the hidden and manifest worlds. By them He hath made the holy realities that are informed by His grace and are the recipients of His outpourings to be the sole revealers of all that pertaineth unto Him, and hath caused them to move through the firmament of perfection in arcs of descent and ascent. He hath ordained these Names and Attributes to be the first and foremost origin and cause of being in the world of creation and the source of the different grades of realities in the degrees of existence. When, through its power of attraction and propagation, the Day-Star of Names and Attributes shone upon the hidden realities in the heart of the unseen realm, they issued forth, were spread abroad, scattered about, set in order, became the recipients of the grace of God and His outpourings, and were made to be the sole manifestations of the Divine conditions and Eternal signs. Emerging from behind the veils, they appeared clothed in raiments of light, moving in the firmament of the unity of God, in orbits of sanctity and circles of glorification...."
We no longer have to live with past scriptures, they have all been explained in what Baha'u'llah offered.
At the same time I also say, you do not have to see it that way, and I am not here to convince you either way. I can only offer there are different frames of references available. Truth is subjective, how willing are we to search into all things?
Regards Tony