Thus, the evidence is clear that belief in “ape-men” is unfounded
So misleading. Science doesn't teach that they were 'ape-men' although it would not be inaccurate. It would not be inaccurate to call homo sapien ape man either. *eye roll*
Since then, many Neanderthal fossils have been found, confirming that he was not much different from modern humans
Oh, but he WAS different! There is an ongoing debate within academia as to how "advanced" he was---and that is expressed in the sentences that followed. However we have mapped their genome---they are different---and they were symbolic thinkers that buried their dead.
NEANDERTHAL MAN is also one of the better-known parts of the so-called evolutionary chain
And yet they are not our ancestors---though we share a common ancestor. Evolution isn't a chain--it's a tree with many branches.
One encyclopedia now says that they were “completely human, fully erect.”
Yes, they were completely human. homo neanderthalis. Some scientists think a better classification would be homo sapien neanderthalis and modern human should be homo sapien sapien. This proves nothing except we aren't the only humans in history.
It is true that when fossils were originally found, Neanderthal was portrayed as a not-so-erect ape man. But this is because the findings were interpreted by people that could not accept that another, viable, and somewhat advanced human species (or sub species) existed. They still were under the notion that we were very unique, and no other species could come close. Later findings and understandings have really smashed this image.