Share your worldview?

[Astreja]

Origin
How do you think we got here - how did humans originate?
Where did the universe/world come from? Big Bang, God, other?

Humans evolved from other primates, who in turn evolved from other animals.  At some point billions of years in the past, complex organic molecules aggregated into the first forms of life, self-replicating molecules, and then changed into other forms in response to environmental pressures.

Big Bang marks the start of the known universe.  I believe that matter/energy has always existed in some form or another, and that creation ex nihilo is an absurdity and a contradiction in terms:  Creation requires energy, and there is an equivalency of matter and energy; therefore, at most a creator-god could rearrange the matter/energy that already existed and could not have created it.

Meaning
What do you think the purpose of life is?
Does human life have meaning? If so, what gives that meaning?
Are humans more significant than other creatures? Are we special? Why?

There is no one purpose of life.  It is entirely subjective and unique for every sentient being.  Human life has meaning if we choose to see that it has meaning.  Humans are significant primarily to other humans but not necessarily to any other beings.

Morality
Why do we have moral ethics? Why do some things ‘seem’ bad (like murder)
Do good and bad exist? How do you determine what is good or bad?
Are good and evil subjective or universal/absolute?
If you don't believe in sin, do you ever feel guilty?

Moral ethics are a consequence of living in communities.  Things that make the community unsafe for its members, such as theft or murder, become problems for the community to solve and lead to the creation of codes of law and law-enforcers.

Good and bad exist as actions and perceptions, but are not innate properties.  "Good" relieves suffering and increases happiness; "bad" increases suffering.

I see good and evil as subjective for the simple reason that they are value judgements.  In a stable, thriving community there will appear to be an objective standard, but I think this is an illusion created by the fact that people tend to want similar things like safety.

I feel guilty if I violate my own code of ethics, for instance not following through on something I had intended to do.  It doesn't happen very often, though.

Destiny
What happens to us after death?
Is there a heaven / hell? 
If so, how do you get there? Is there anything specific you have to do?

I believe that the self is wholly dependent on the physical brain, without a "soul" component.  When we die, the brain circuitry that supports our self-awareness and personality rapidly breaks down and cannot be restored, and "we" are gone forever.

I do not believe in either heaven or hell.