Atheism and Ethics

[Lucian]

It sure seems like there are objective differences on the moral spectrum between building a bionic limb for a three legged puppy and skullfucking my neighbors.

Here's a pump for you.  Perhaps it could only be the case that there were no objective differences between those two acts if there was some super powerful genie majicking the world into a perpetually counterfactual state in every moment everywhere.  Such that you couldn't so much as complete any fact-statement about anything before it was somehow™ untrue.  I start a breath by thinking my name is john but by the end of the exhale the past has been rewritten and my name is bill.

Yep, I recognise that it seems that way to me also. But on what basis do you take that seeming to be true? As in, do you just rely on the seeming to be the case and stop there, or can you ground it in something else? To lots of people it just seems like there must be a higher power or a god of some sort
Not too sure about your genie example…