Can Atheist be objectively moral in the case of a possible follower of an infallible?

[robvalue]

It was written by a human. The motivation most likely is to control people with fantastical tales, granting the authors divine righteousness to push everyone around. Or perhaps it started off just as a work of fiction loosely based on reality. Who knows why they wrote it? Jumping to "its magic from God because it's strange" is about as big an unjustified leap as you can make.

You are dreaming up fantastical scenarios in your head which require huge numbers of unfounded assumptions, to try and get around the fact that the book is not having the effect you'd expect it to have if it was inspired. It's much more likely it is not inspired. That requires no assumptions at all.

The God you describe sounds like a dick head I'm afraid. He's deliberately making us unable to interpret his message correctly, not stepping in to stop the confusion, and allowing people to literally kill each other over the differences. This is a dick head. It's certainly no benevolent being. Whatever his twisted idea of morality is, I want no part in it. I'm afraid you've kind of shot yourself in the foot there.