You, and everyone, hears a voice in their heads asking them to go outside if possible. If not the building you’re in becomes transparent. If blind you are temporarily allowed sight.
The sky becomes a large screen and a simple and gender neutral face appears. It says, in whatever language you speak best, that It is the creator of the universe you live in. It says that the universe is an advanced simulation. One of countless trillions of simulations with subtle differences in physical laws. The reality you know has random physical laws and bears no reflection on the Creator’s reality.
He has appeared to you because the simulation has run its course. Because sentience has arisen in some small number of the simulations He has decided to allow the relatively few universes with sentience to keep running until their heat deaths. Because changing the laws of your universe after the simulation is running is very difficult due to the methods He is using, He cannot eliminate death or create a utopia. In fact what you are currently experiencing is simply a set of memories that are being encoded into all humans.
He wants you to know what you are because He feels that you should understand your place in reality and specifically wants you to discard the counterproductive religions that have sprouted up.
He also lets you know that as far as His people have been able to discern, there is no God. The laws of His universe are such that there is very high confidence in this.
He then disappears. Everyone on Earth has these same memories.
What do you do?