No, I think you'll find that atheists can tell the difference ...
Maybe my idea was not clear, but by 'not any different' I meant that humans, from an atheist point of view, are just another type of animal.
I don't see that they have more of a dilemma than you do: as I have pointed out, the intermediate forms exist whether or not you admit that they are evidence of descent. And why can't they get out of it the same way you did, by saying: "I also think his whole creation is somewhat also 'in God's image'"?
Bblically, humans have a soul, and animals do not. Thus why humans are 'in God's image'. (I checked this out since starting this thread, and it seems this is the most common view amongst theologians in regards to what 'in God's image' means.)
So from a YEC point of view: the answer is simple: humans were created fully humans from the beginning, and so had a soul right at the start.
from an atheist point of view: humans have no soul
but from a theistic evolutionist point of view, it is more difficult: where along the humans ancestry lineages did they get a soul ?