Are all people really created equal?
Equal in what context? If it's some sort of physical or mental property, of course not. Isn't that blatantly obvious?
However, assigning people rights relative to their physical or mental qualities by default is foolish. There is no reasonable evaluation that can determine one persons' productiveness, so it makes much more sense to give every person under the same flag the same set of rights, privileges and laws.
Hmm, according to Darwin's theories, there will be variance within a species... so if we're talking about physical equality, no.
How about according to common sense? Look around you. People have different heights, body builds, hair colors, arm lengths, weights, etc.