In response to the conjecture that all he needs to prove citizenship is a (forged) COLB - Just a COLB? Really? so Obama has spent close to 2 MILLION to hide what he doesn’t need to hide? I don’t THINK so... Natural born citizen has distinct legal requirements - all of which are probably moot because he was legally adopted in Indonesia and DID NOT file for US Ccitizenship at age 18. THere is much more here than meets the eye, methinks...
Being legally adopted in Indonesia (which there is no evidence of happening) would not require him to file for US citizenship at 18.
No actions by your parents can cost you your citizenship if born in the USA. You would have to take a pro-active step, like refusing to live in the USA, voting as the citizen of another country, etc. Something that actively shows you have accepted citizenship elsewhere is required. Without it, your USA citizenship stands.
If you have evidence that Obama served in the Indonesian Army, or voted in their elections, you might be on to something...