I've just finished reading Steven Pinker's book,
The Language Instinct, which covers most of the areas discussed in this thread. Pinker discusses among other things: Chomsky's Universal Grammar theory, the origins of early language, similarities between ASL and verbal languages, language centres of the brain, and lots more.
I'll also mention that the 200 words the eskimos have for snow is an Urban Legend, it's somewhere closer to twelve.
I'm afraid to disappoint some of you, but it's widely accepted that English is a Germanic Language. Please feel free to read:
http://www.wordorigins.org/histeng.htm
Also, English was influenced by Latin because, up to a few centuries ago Latin was considered the language of the educated. If you wanted to
be someone, you'd end up speaking Latin, Greek, and English. It might have been unclear before, but the first English speakers were descended from Angles and Saxons (both Germanic tribes), French speaking Normans, or Norsemen, and Vikings. Original English speakers weren't descended from the Romans.
Iain