This is evidence that God is only source of ultimate morality.
To paraphrase what Marlowe says, if you think you came from a rock, then there's no reason to have any more morality than a rock.
Truly, God is the only possible source for absolute morals. Everyone else suffers from the "observer problem" because we are part of what we observe. Thank you for your post!
Nor does it seem that there is any reason to struggle more than a rock. These people will self-destruct.