I make a distinction between consciousness and self-consciousness (being aware of oneself). I would state that at least in living beings you can find forms of consciousness. And I find it safe to say that humans definitely do show self-consciousness, again in different states. Having said this, I think that I am alive and am conscious about this. This in itself need neither be falsified nor verified. If I cannot be certain that I am a living being, all other things would be irrelevant, I guess. I might as well think that I dream my life.

It would sound exceedingly ridiculous if someone said that I only believed I was alive, wouldn't it? I would not put such a thing under a question of faith.
In the same way, I remain open to the possibility that the earth and the sun and the cosmic bodies may very well be conscious, just beyond what I, as a human being, can comprehend. :)