For Paul, the work of Christ does not establish a union with humanity in general but rather for a distinct group: “Christ loved the church and gave himself up for her” (Eph. 5:25)
Let’s suppose that at some point in the future the Big Bang Theory is deemed wrong. Would that mean that the universe is eternal? No, for a number of reasons.
This year it’s COVID-19 and maybe next year it’s something else. They have been testing this and that, mixing our foods with hormones and playing gods with our weather.