You don’t get it either. All we want to see is some proof that he is a natural born citizen as required by the Constitution. Just upholding the Constitution of the United States of America. No more no less.
By the way why don’t you try to get a bank loan with no proof of ID?
Obama has a passport issued by the United States. That means the government beauracracy has decided he is a citizen. So it isn’t a matter of him having no proof of ID; the question is whether he was actually born in Hawaii, or if someone managed to falsify the records in Hawaii to make it look like he was born there.