Order of the Puritan
I don't mean to be rude, but I'd appreciate a lack of expectation for historical figures or organizations. I've started on the world's story already, have a plot in mind, and I feel bad if I don't include suggestions from people, so if suggestions throw a wrench into my plot, I have two options: accept the idea and try to mold the story around that difference, or ignore the idea and feel like a jerk until I forget about it. The Order of the Puritan would be potentially fitting in the social climate of the forming world, but its role would be reduced and its influence diminished. Also, there wouldn't be vanilla humans feeling superior to any of the other races any more than the others feel superior over the vanillas. As far as any species is concerned, they themselves are the original and best.
EDIT: I really need to get working on civilizations, civ leaders, and the political situation, but I can't do that unless I know what races to use. If nobody has anything to say on the matter (that is, a simple description of the races they have in mind) by tomorrow, I'm going to go with well known species. I really don't need much to work with; just type a couple of sentences on what they look like and what their mindset is tilted toward and I'll fit them into the world.
SECOND EDIT: Guess what? Social skills is what! I figured out how social skills will work: Charisma and Presence are the two attributes that govern the skills (except Detect Purpose, which uses Int). Presence has two categories, much like Knowledge () or Survival (); the categories are Calming Presence and Agitating Presence. They affect different checks in different ways. For example, the Persuasion skill is a soft skill, which means it has Charisma applied to it as a positive modifier, Calming Presence applied as a positive modifier, but Agitating Presence applied as a negative modifier. Race choice affects Presence the most (an orc would have a large penalty to Calming, but an equally large bonus to Agitating. A diplomatic elf, on the other hand, would be the opposite). Following that would be your attributes. In addition to those modifiers, your presentation and argument (as in, you, the player) will give circumstantial bonuses or penalties to the skill check. That is to say, you will not be able to Bluff a guard into thinking he's a yellow-footed rock wallaby; it would have far too large of a 'that's dumb' modifier to work.