Not that I care about religious topics much, but I thought I'd post here.
You will not find a logical argument to dismiss a contingent reality with an amoral god, however there is no logical necessity for god to be amoral.
If such an amoral god existed, he would not understand human morality.
A truly amoral person is a sociopath unable to connect with the states of others, but capable of cooperating for their needs and wants.
An indifferent god would not be amoral, but he would simply be uncaring about human affairs.
I think it wise to assume that substance is morally neutral. Therefore, god is only responsible for the maintenance of reality, but he isn't accountable for
the interactions of substance in reality and the choices from free-will.