I think of atheism and secular humanism as being pretty much the same, but they have arrived at their sameness from different origins. Atheism says, "We do not have sufficient evidence to believe in a deity," and derives a moral code from the need to create one for ourselves. The Golden Rule is paramount.
I'm sorry...but no.
Some atheists say that, but it's certainly not "a necessary part of being an atheist". As has been pointed out on numerous previous occasions, there are atheists who are racist, atheists who are misogynists, etc. Atheism, in and of itself, has
no moral code whatsoever.
It's only once you add on to that initial conclusion that "there is no god", and then take the
next step of developing a moral code (and what you will base that code on) that you start getting something else. Secular Humanists and Communists, for example, are both fundamentally atheist (or non-theist) systems, yet the two have moral codes that are quite radically opposed to each other.
Secular humanism says, "We need to create a moral code that is fair from logic," and the Golden Rule seems to be a good starting point.
I'd also disagree with this, in that the question of "fair" is itself is determined by one's moral code. Again, both Humanists and Communists would say that they are seeking things like 'fairness', 'equality', etc.; yet they have vastly different ways of achieving those goals.
And for the record, as a Secular Humanist, I think that the golden rule is crap, and should
never be the basis for a moral system. For example, someone who says, "If someone had more power than me, I'd expect them to use their power to control me for their own benefit" can, by the principles of the golden rule, therefore conclude that
"If I have more power than someone else, I can use my power to control them for my own benefit."