Simple Simon
Simpleton
The definition of Homo isn't "fully human". You may want to consider all members of the genus to be "fully human", but it's no more definitionally necessary than it is to consider a donkey (Equus asinus) "fully horse".
For most of the 19th century, and also large parts of the 20th, the man/ape distinction was actually defined like this but many parties: scientists, politicians, religious leaders. Even today you will often hear people say 'it's only an ape' as soon as an animal falls outside Homo. For a very long time, the main charachteristics distinguishing man from pre-Homo-animals were supposed to be language, culture, and complex social structures. Today we know that that's wrong, and that man is either a Great Ape, or Orang falls outside that clade. But in the general public opinion, this distinction is still made based on these characters, and I use the term 'fully human' in that sense - and that sense only.
That is not (I think) true either. Darwin didn't come up with evolution, he just figured out that it happened by natural selection. And not everyone was terrified of contradicting religion - Darwin didn't invent atheism either.
Yes, and yes, and Lamarck comes to mind. I never said Darwin invented atheism, nor 'evolution' in the broad meaning of the term. But Darwin and Wallace were the first to publish the concept of evolution through natural selection, despite (at least for Darwin) massive misgivings about the theological implications. In that respect, they are special.
There were many other thinkers who voiced criticism re god, but nobody before Darwin (rather: his bulldog, actually) based atheism on natural sciences publicly! Usually, philosophical or theological arguments were used. If I missed someone who did predate Darwin, please point him (or her?) out to me