Always love this question... really shows the bias, blindness and plain non-thinking of the (insert your belief here).
There are many sources of evidence, scientific evidence and research on origins. Some are so whacko that you cannot help but laugh, due to faulty logic. Some back up their POV with assumptions they claim as fact, etc. Some back up thier claims with facts and evidence - you get to pick through the minefield.
For the thinking person out there, I have three questions:
(1) were you there at the beginning?
all we can do is make assumptions and theories based upon evidence we see. If the evidence we can see, or use true science to re-create/test our hypotheses, shows something different than our assumption, do we ignore the results because it doesn't fit our assumption, doctor the results to match our assumption, or re-evaluate our position? Our personal bias is always in play.
2) All Origins stories rely on faith. From the most bizzare, to the one that you like. You cannot prove macro-evolution any more than you can a six-day, young earth position, or the (e.g.) Navajo creation story, Japanese creation story, etc. Hopefully, you use reason, intellect, and evidence along with your faith. It takes incredible faith to believe that the evolutionary model brought you "from the goo thru the zoo to you".It also takes faith to believe God did it in 6 days.
3) Why do you believe what you believe? Because you were told "that's the way it is", did you reason thru both sides of the coin, read, study the pro and con books, etc., and choose? Or, like most, you just don't care? Do you believe it because the "other" side implies a different outcome, or even may require you to alter your life/lifestyle?
The Law of non-contradiction applies here, too. everybody's belief can be wrong, but only one belief is correct. Age of the earth/Origins is a fixed point. special creation/macro-evolution are mutually exclusive. Each belief system ultimately affects how you see yourself, how you live, and how you think you'll spend eternity - sometimes subtle, sometimes overt. as Pascal (if i remember correctly) implied in his letters, 'you'd better be right'.