Prologos,
Since I am not the author of the theological definition of "temporal" vs. "eternal" in religious terms, I cannot say more than the religious persons who developed these terms in the first place. My mention of these definitions is not to imply that I have anything invested in these religious definitions either. I am just repeating them.
I do know, however, that according to Roman Catholicism, there was no time until the universe came into existence. God existed since according to them God is eternal, but the universe and the space-time continuum did not. Eternity as they and Jews define it is not a form of time. To them eternity is far different from living forever. They are not the same, according to them.
Speaking in your terms I am sure you might find a way to bring things together according to your worldview (which seems a very healthy approach in MHO), but this will not change the doctrinal and dogmatic definitions in religions. While theology can change, dogmas cannot, and I cannot say what this falls under for them. But I am sure, knowing Jews and Catholics, there is room for personal interpretation as well in this.