I guess it's time for an Objectivist to pipe in.
To preface...there has been mention of Objectivism as a philosophy, or a "school of thought," something a person subscribes to, like a magazine subscription or something. If you were to ask an Objectivist, "What is your philosophy?" his or her response would most likely be something like, "None."
I see a philosophy as a set of beliefs, values and standards that a person chooses to believe in. Objectivism is anything but that. As arrogant and narrowminded as it sounds, Objectivism is simply the recognition of objective truths.
Now to nitpick.
The whole "human rights" thing is great, because I think that there are certain rights that should be granted to all human beings (note that I say "granted", not "recognized"; I really don't think that you're magically "gifted" with rights from birth from some higher power or somesuch).
Such a statement leans more towards Secular Humanism than towards Objectivism (still very far away from either, though.)
To recognize the natural-born rights of a human being, one has to imagine if there were only one human being on the planet. What rights does he have? Obviously he has a right to his property, to feed himself, to pursue happiness...but what does this all matter, when there's nobody to take those rights away? Until another man appears, and hits the first man with a stone to steal his meat, the first man has no concept of his own rights. In this sense, natural-born rights are just that...natural born, inherit in all human beings...but they can only be realized when they are threatened. The great human ability to empathize grants us the knowledge of what constitutes a transgression, a violation of another man's natural-born rights.
My biggest complaint with objectivism has been with the attempts at using "the virtue of selfishness" to address all issues. It reads like a knee jerk reaction to solcialism/communism.
It's anything but. Again, look at the lone man on the planet. This lone man is initially wholly selfish...self-serving. He seeks food for himself, he seeks stimulation for himself, happiness for himself, etc. When that one man meets another man on an open plain, the virtue of selfishness can show its legitimacy in the social arena, in the form of
trade. The first man has a stick, but needs a stone. The second man has a stone, but needs a stick...so the two trade, to each others' selfish benefit.
When the man meets a woman and bears a child, he hunts for and gathers food for the child, because he values it. Again, he is being selfish.
So the virtue of selfishness does not need communism or socialism to exist or be legitimate...such things only make it more evident.
That said, I think perhaps the most striking difference is that "Humanism insists that personal liberty must be combined with social responsibility". Objectivism actively rejects social responsibility in favour of individual self-interest.
I would agree wholeheartedly. This is certainly the most significant difference between the two.
In my observation, Secular Humanism appears to be a more "friendly" kind of Objectivism. While it still advocates reason over mysticism, rationalism over irrationalism, non-contradiction, and creativity...Secular Humanism also advocates social responsibility...and in so doing contradicts itself. You cannot force one man to be beholden to another without violating his natural-born rights and sovereignty.
Secular Humanism attempts to reject the most hated dogma of Objectivist thinking...the idea of virtue in selfishness. There is a great deal of stigma attached to that root word, "Selfish." (I think if Ayn Rand had chosen to use another word in its place, like "Tastycakes," Objectivism would be much more popular.)
As to that:
So, yeah, I can see how it might seem that it's just a good PR way to "blend in with the crowd" while simultaneously saying "I also don't believe in God"...
I don't really think there's any PR friendly way to say, "I don't believe in God." In my American experience, anyway, when someone asks you what you believe in and you say
anything other than Christianity...you're immediately pigeon holed with Satanists, Anarchists, Communists, Socialists, and all the other condemned folks.