This is still speculation. May there be a thinking rock? Possibly, but only due to random chance.
I'm betting that in the vastness of the universe, across the whole volume (and especially across all time) there are (/have been/will be) spontaneously created 'living rocks', some form of self-organising crystals arising on a boundary layer of a planet's mantle/core, or wherever else such things might happen. But of course whether that 'life, but not as we know it' ever develops intelligence is another matter. Any self-organisation/replication strategy that develops will do quite well (at least until its 'habitat' changes) by definition, but as many living things that we see do well enough without intelligence and society (as we know them), they're probably not a universal 'solution' to keeping life going...
Ditto with self-organising plasmas and/or magnetic fields in stars or nebulae...
(Also, I don't rule out the possibility that there is/has been/will be a civilisation, or at least a population, of 'something life-like' at the edge of the Earth's core or in Sol's photosphere, equally as ignorant of us as we are of them. But I certainly wouldn't say that it's a certainty, and we probably all work at completely different scales of distance and time.)
I still don't think that there's a "God thing" out there telling the rock to think.
I'm with you there. But that's not to say that the rock (or whatever)
thinks there's some ultimate guiding force. And what would be really funny is if we end up having unknowing interactions with each other, and two intelligences interpret the other's ignorant fumblings as the other.
Watering it down, and into a DF POV, the dwarfs find that...
...there are horrible demons living deep down in the lower levels of rock and tend to build up forces to repel them. What if the demons are equally happy except for pesky creatures from the horribly cold and exposed 'heights' of the world that keep tunnelling into them and unleashing some form of environmental catastrophe, and that's why they build up armies of their own kind, ready to strike at the 'horrors above'.
But that's nowhere close to how I envisage our interactions with alternate-life brethren of our own. Eyjafjallajökull (yes, I had to look that up) could have been the result (indirect, possibly) of the latest exploration attempt of Earth's very own magma-beings to explore (or exploit) the upper reaches of the cold and inhospitable void of rock-space. Could, of course. It's way out there as an idea and worthy only of novelisation[1], not for serious theorising or even (I would hope) the basis of a new belief system.
However, the point is that life (possibly definable as self-replicating, self organising 'structures' with
localised entropy-busting effects within some medium or other) is almost certainly going to happen somewhere in any form it can possibly happen. Thought and consciousness and society and (to pinch a term from Cohen and Stewart) "extelligence" are going to be less likely. But based upon my general idea of life itself being almost infinitely prevalent, even a small chance of such things arising are going to make them arise any number of times across the entirity of existence. Ignoring, for now, panspermia and civilisations 'bootstrapped' from prior civilisations with an eye to meddling and moulding...
[1] I'm sure it's been done, but the only book that comes to mind is David Brin's
Earth, which doesn't so much have abiogenesis as an actual (unintentional) act of creation of an alternate intelligence. More or less.