You see I'm not arguing that anything exists that we do not both agree exists. If you would like to say that morality cannot exist sans some god(s) then there just isn't any reason to believe in morality. Just people trying their best to get along with one another for... whatever reason. From there it is up to you to show that there is anything more to appeal to and then to demonstrate SEPARATELY that this something more is something more than some god(s) subjective opinion.