Was Obama hiding being adopted by concealing his birth certificate?

Nick Chase at American Thinker has an interesting theory regarding Obama and his Birth Certificate.

We can now say beyond all doubt that Barack Obama (Soetoro) was born in Honolulu on August 4, 1961, and is a native-born U.S. citizen. All "official" evidence prior to the release of the long-form "birth certificate" forgery told us this -- his short-form birth certificate, statements by Hawaii officials, the contemporaneous birth announcements in the Hawaii newspapers, his (birth) father's correspondence and dealings with the Immigration and Naturalization service, Obama/Soetoro's registration form for Fransiskus Asisi school. Now we have the "birth certificate" forgery itself to seal the deal, because by knowing what was being hidden with the release of the forgery -- his legal adoption -- we know what was not being hidden -- his place and date of birth.

Andy McCarthy has posted this theory as well. In Suborned in the USA (National Review Online, July 30, 2009) he wrote:

"Obama and the media worked in tireless harmony to refute any indication that he had ever been a Muslim. It's now apparent, however, not only that he was raised as a Muslim while living for four years in the world's most populous Islamic country, but that he very likely became a naturalized citizen of Indonesia.

"Shortly after divorcing Barack Obama Sr., Obama's mother, Stanley Ann Dunham, married an Indonesian Muslim, Lolo Soetoro Mangunharjo, whom she met - just as she had met Barack Sr. - when both were students at the University of Hawaii. At some point, Soetoro almost certainly adopted the youngster, who became known as "Barry Soetoro." Obama's lengthy, deeply introspective autobiographies do not address whether he was adopted by the stepfather whose surname he shared for many years, but in all likelihood that did happen in Hawaii, before the family moved to Jakarta.

"Under Indonesian law, adoption before the age of six [Correct age is five - Nick] by an Indonesian male qualified a child for citizenship. According to Dreams from My Father, Obama was four when he met Lolo Soetoro; his mother married Soetoro shortly thereafter; and Obama was already registered for school when he and his mother relocated to Jakarta, where Soetoro was an oil-company executive and liaison to the Suharto government.

"That was in 1966 [Correct year is 1967 - Nick], when Obama was five [Six - Nick]. Obama attended Indonesian elementary schools, which, in Suharto's police state, were generally reserved for citizens (and students were required to carry identity cards that matched student registration information). The records of the Catholic school Obama/Soetoro attended for three years identify him as a citizen of Indonesia. Thus Obama probably obtained Indonesian citizenship through his adoption by Soetoro in Hawaii. That inference is bolstered by the 1980 divorce submission of Ann Dunham and Lolo Soetoro, filed in Hawaii state court. It said "the parties" (Ann and Lolo) had a child (name not given) who was no longer a minor (Obama was 19 at the time). If Soetoro had not adopted Obama, there would have been no basis for the couple to refer to Obama as their child - he'd have been only Ann Dunham's child."