“I’ve never encountered “sinlessness” mentioned as a Divine attribute “
I think it is a very major attribute. Were it not so, there would be no need that I can think of for heaven and hell. Heaven is a place of no sin; we can’t go there because we are sinners; Christ died to atone for our sins so that we could be declared righteous and so get into heaven. That’s a very central Christian doctrine.
Do you propose that God is a sinner? I can’t imagine how. We’d have no need of a Savior, then. Or God would need one.
You can’t possibly have read my whole post!