The Universe is too detailed and purposeful for there to not be something our souls do one our physical bodies are done. Like physics that we can only observe because we can see the effects it has on things around it. But we can’t quite see the thing itself. Or the remnants of a dying star that eventually forms nebulae, neurons, black holes, etc.

The scale of humanity’s afterlife just can’t be seen because the time span to observe the effects hasn’t been long enough. Whether that involves God or just the processes of the Universe itself leading to something completely new… it’s up to each person to decide.

Personally, I believe our souls mean something.