I think your grave error is in assuming that God can not reveal anything that is eternally valid, that and the concomitant mistake of equating an eternal revelation's validity with its being perfectly comprehended. Yet in Catholicism the model of the follower of Jesus, namely Mary, keeps BOTH aspects.
Sermon 15. The Theory of developments in Religious Doctrine
"But Mary kept all these things, and pondered them in her heart." Luke ii. 19.
"Thus St. Mary is our pattern of Faith, both in the reception and in the study of Divine Truth. She does not think it enough to accept, she dwells upon it; not enough to possess, she uses it; not enough to assent, she developes it; not enough to submit the Reason, she reasons upon it; not indeed reasoning first, and believing afterwards, with Zacharias, yet first believing without reasoning, next from love and reverence, reasoning after believing. And thus she symbolizes to us, not only the faith of the unlearned, but of the doctors of the Church also, who have to investigate, and weigh, and define, as well as to profess the Gospel; to draw the line between truth and heresy; to anticipate or remedy the various aberrations of wrong reason; to combat pride and recklessness with their own arms; and thus to triumph over the sophist and the innovator."
God Himself is infinite, yet we can know by reason of His Existence with certainty, and yet never exhaust our understanding of God. The same with what He reveals.