One is certainly stretching to make that claim. The court is never going to say that just because she was young when she had Obama, she was not a natural born citizen.
and then he was adopted and registered as a legal citizen of Indonesia at a time when his American citizenship had to be renounced in order to do so...
Except he was too young to renounce his citizenship at the time, so I'm quite sure the court isn't going to consider that as carrying any weight.
He then traveled under his Indonesian passport through college and never naturalized as a US citizen after...???
I'm not familiar enough with laws regarding passports to comment on this. But I would be surprised if the court looks at this as proving Obama is not a natural born citizen.
The poster you replied to was not questioning her citizenship, but to her age when Obama was born. And what they were point to was her age if Obama was not born on US soil.
You need to refer to the laws that determine if a child born to a US citizen overseas is a citizen (this is what the poster you replied to was addressing - of course the poster was assuming that Obama was not born on US soil - which I doubt is true at this point.)
Birth Abroad to One Citizen and One Alien Parent in Wedlock:
A child born abroad to one U.S. citizen parent and one alien parent acquires U.S. citizenship at birth under Section 301(g) INA provided the citizen parent was physically present in the U.S. for the time period required by the law applicable at the time of the child's birth. (For birth on or after November 14, 1986, a period of five years physical presence, two after the age of fourteen is required. For birth between December 24, 1952 and November 13, 1986, a period of ten years, five after the age of fourteen are required for physical presence in the U.S. to transmit U.S. citizenship to the child.
Omama's mother would have had to be 19 at the time of his birth - she was 18.