Humanism is a progressive philosophy of life that, without theism and other supernatural beliefs, affirms our ability and responsibility to lead ethical lives of personal fulfillment that aspire to the greater good of humanity.

...but how do they ground all this?

Humanists ground values in human welfare shaped by human circumstances, interests, and concerns and extended to the global ecosystem and beyond. We are committed to treating each person as having inherent worth and dignity, and to making informed choices in a context of freedom consonant with responsibility.

But as we've already said, they have no rationally justifiable ground for any belief in the "inherent worth and dignity" of any lifeform on earth including humans.

Post Edited (One Love) : 6/20/2010 11:25:43 PM (GMT-5)

Here's something along similiar lines in HM#2...

We find insufficient evidence for belief in the existence of a supernatural; it is either meaningless or irrelevant to the question of survival and fulfillment of the human race. As nontheists, we begin with humans not God, nature not deity.

Then HM#3...

Humans are an integral part of nature, the result of unguided evolutionary change. Humanists recognize nature as self-existing. We accept our life as all and enough, distinguishing things as they are from things as we might wish or imagine them to be. We welcome the challenges of the future, and are drawn to and undaunted by the yet to be known.

Post Edited (One Love) : 6/21/2010 12:43:13 AM (GMT-5)

D: Dang. It's a "blindness" not of groundless hope (what some atheists say about theists)...but of defensive unwillingness to see all the possibilities in reality (including the existence of an Uncreated Creator who is Love).

J: Right. Defensive.

As I think about it, perhaps that's why loving theocentricity is the only real human perspective to have. Creation testifies to God by its very nature...and to separate Creation from God in the mind just leads to EGO-centricity and life in negation (suffering, loneliness, hopelessness, hatred, etc).

That's why we are so crazy.

Saying we are sinners is just saying that we are neurotically addicted to sensory things and self-referential "world-composition" that we can't perceive reality AS IT IS in God...even though we have the natural equipment to do so: God himself within us (via the Holy Spirit).  We are so busy thinking about who we THINK we are...that we don't spend enough energy perceiving God, who will REVEAL who HE is and who WE are.  So we live in darkness and ignorance, doing obviously egocentric, self-destructive behavior that is totally out of sorts with Truth.   

...

To the extent that we 1) separate ourselves from Creation in our own minds and 2) separate God from Creation in our own minds [particularity in our self-referential activity, which GROUNDS identity formation], we will begin to misapprehend reality and go crazy, being sinners...operating according to false, destructive perspectives.

Case in point.

Post Edited (One Love) : 6/21/2010 1:14:19 PM (GMT-5)