That would really depend on how aliens exist. If they exist in some way that eradicates all old questions about the existence of God and the nature of consciousness, then presents a clearer and more accurate way of viewing the cosmos, things could get messy as some will want to cling to the old ways and hold others back. It doesn't seem plausible that once the evidence is out there that denial would be anything more that a quick trip to absolute madness while watching everyone working with coexistent aliens advance technologically, socially and philosophically.
Decades of intentional programming. Due to edited texts of past events combined with said interpretation (literall, symbolic or describing scenarios beyond understanding under the writers said point of reference regarding technology which have us guessing in regards to interpreting their way of describing said scenarios) have most of mankind reinterpreting their respective religion in a less than ideal way.
It's also interpersonal regarding how said person (mankind) creates hope, love, ethics and morals while the underlying framework of X religion guides their lives.
When inserting the existence of ET life it brings a myriad of interpersonal reactions. Especially regarding the many ways the, lets say, disclosure happens.
What will be narrative? That will play a huge part in how humankind will cope in such a scenario.
With that said. The real shock would be a full disclosure of our past. The multiple resets, suppression of knowledge regarding our origin and so much more.
This is why I suspect this gradual mainstreaming of UFO OUT OF SPACE is a psy op. Anno 2023 UFO and ET existence has almost become boring ie normalized. By design.
Again I feel the real truth about crafts, aliens and such, while real, all stem from suppressed and manipulated knowledge regarding our history.
/rant and not especially talking to you personally
Raistandantulus
but more of a train of thought <3