Suppose that without supernatural beings, life has no meaning or value (taking that to be "existential nihilism").

If it is revealed to such a world that there are in fact supernatural beings, how does that create meaning and value?

And how do those supernatural beings derive meaning and value; don't they need another level of meta-supernatural beings?

I want everyone to have meaning; I don't want there to be supernatural beings which are kind of slaves to provide me with meaning by their existence, but are themselves starved of meaning since they have nothing more supernatural than themselves to believe in.

One useful definition of meaning is the evolution of possibilities. A situation of no meaning is one which is a dead end in terms of possibilities.

If the universe dies in a heat death, then at that point there are no future possibilities distinct from the current state, and so there is no more meaning.

There might be no permanent meaning; no value that will endure forever, but people can be content with the temporary meaning, in which they enjoy new experiences and explore new possibilities in any endeavor.

Human lives end come to an end on a time scale vastly shorter than the death of the universe, yet people are able to find meaning.