When the Vatican gets it right...

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The Church has accepted evolution for awhile now.

^^^ Correct.  Even in Mississippi I was taught in Catholic Sunday School all my life that the Earth is billions of years old.

This is not news at all, and strikes me as a way for the bizarre crusade against Catholics on this forum to continue.

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I am a little confused, so please enlighten me...

Does the Catholic church believe we are all descended from the Adam of Genesis, or not?

This is from Americancatholic.org:

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if you don't believe that Adam & Eve existed, doesn't the whole system start to break down?

good question, but I think a simpler and more straightforward question is: 

Does denying that current-day-humanity descended from Adam contradict the bible's own interpretation of the story of Adam?

No, because it's just a story (and stupid arbitrary sexist story at that).  The lessons of that story are what's important, not whether or not it actually happened.

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if you don't believe that Adam & Eve existed, doesn't the whole system start to break down?

good question, but I think a simpler and more straightforward question is: 

Does denying that current-day-humanity descended from Adam contradict the bible's own interpretation of the story of Adam?

No, because it's just a story (and stupid arbitrary sexist story at that).  The lessons of that story are what's important, not whether or not it actually happened.

how could you say it isn't important?  it is the basis of original sin.  without original sin, how did we become sinners?  we were created that way?

and if you accept the theory of evolution, that would seem to make your position all the more difficult.  when did sinning begin?  with one-cell organisms?  with proto-humans?

without Adam & Eve the whole thing stops making much sense.

We are all sinners.  The first sinner was the first protohuman who was self-aware and did something wrong.

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that has no scriptural basis at all.

well obviously.  The people who wrote the Bible had no concept of ideas like that.