I haven’t found the place in Darwin’s writings where he says that life came from a rock, or what he thinks it came from at all. That last site may not be a creationist site, but it’s just a “Critique of Darwin” by a former airline pilot. Why should we accept his assertion about what Darwin said if he doesn’t quote or reference the source either?
It is covered in Darwins writings. More than that it is simple logic. If there is no creator than there has to be spontaneous generation. No he doesn’t state specifically that a rock came to life but again before life existed rocks are about all there is. The biggest problem you and other evolutionist have is you don’t want to defend this simple fact of the theory, you would rather get past the hard part and argue the part that is logical put still unproven. Just as you wish to state evolution as a proven fact, which it is not. Science by consensus is not science. Perfectly legitimate scientist express doubt in the TOE and are denied tenure and otherwise persecuted professionally, not what I would called honest scientific debate. What it is is the same science practiced by the perpetrators of global warming one either subscribes to it or he faces the unprofessional dogma of these bullies masquerading as scientists.