Hi Sextus,
"One might object that the unresolved disagreements that exist among the defenders of moral realism show that moral values are not real. However, the fact that a disagreement is unresolved does not imply that none of the conflicting views is correct. Even if the disagreements among moral realists were in themselves unresolvable, this would be sufficient for denying that moral values are objective, since it only manifests the impossibility of determining which of the positions in conflict, if any, is correct."
'Not even' seems quite wrong, perhaps ungrammatical, here. Can you omit 'not' without affecting your argument? Or else reword. Even apart from this concern, the combination of 'not even' and 'unresolvable', as a double negative, seems to me problematical.
Clive