How much would humanity's vision of itself change if we knew what exactly happens after death?

Despite any religious answer to the question, we have a view that we are here today and then we are not here anymore (no matter if we are reborn, go to afterlife or whatever), we just assume that whatever happens in death goes to another plane of existence.

Now, if we knew what happens (and it became a mainstream stuff like any scientific "truth" ) it would change completely our cosmovision as species.

Would it be a new step in evolution, at least socially speaking? Would it be a checkpoint in human history and science, specially biology?

Let's debate

If we found out for certain that nothing happens after death, the world would likely fall apart. People just wouldn't give a Bleep anymore. The more extreme religious people would go apeshit. I doubt they'd buy it. Some would remain skeptical. At first, to stop the world from losing its mind, there would be a lot of research into the supposed DMT explosion that happens in your brain when you die. It'd be a lot easier to calm people down if you told them your brain at least creates a heaven that seems like a long time to you. If that proved useless, the next step for researchers would be life extension and an even bigger endeavor of immortality. You bet your ass all of those religious government officials are going to give more of a Bleep about that research when they find its lights out after death.