Do you really think it's okay for each person to determine for themselves what is moral and what is not?
Personally, I think there needs to be some social consensus on what is acceptable and what is not, otherwise we will have chaos and clutter in society.
And I agree that human morality is relative and changeable but God's morality is absolute and unchangeable, and therefore more reliable.
I'm not only saying that it's okay, I'm saying that the bulk of individuals on the planet already make this determination for themselves based on factors I outlined in my previous post.
We already have a number of social consensus's on what is acceptable; laws and religion are two of the more dominant examples. Laws will differ from state to state and country to country, while religion will differ from person to person. Both will evolve or change over time to suit societal needs. This leaves no absolute common ground on which to form a solid consensus on what is right and wrong.
As an atheist, I can't agree with the last part of your last sentence. If you base your God's morality on any religious scripture, then you're basing it on morality of the human(s) who transcribed/wrote it at the time.