I remember reading a von Däniken book when I was quite young, 9 or so, I think and being absolutely fascinated. Then after a while I realised it was pretty much all made up and what has stayed with me ever since was my blazing righteous anger that someone could make up a pile of stuff and put it in a book and claim it was true. That feeling has stayed with me far long than anything from the book itself.
Perhaps most of us can assess something like this and decide for ourselves on the available evidence as to its truth and relevance. What the author claims seems, to me at least, a minor issue. I get it that you do not agree. More generally aside from outright lies and pure stories, there are always analogical levels of interpretation. Presumably, if an unbeliever, you're irate at many of the world religions.