Not with any legal effect, you can’t.
The effect would be any statutes that apply only to citizens no longer apply to you. If there was no effect they wouldn’t have created it. My first guess would be that you could go to Cuba without it.
A more useful act pertaining to income tax would be not using Social Security when you work.
Rubbish. The only way a US citizen can voluntarily become a non-citizen is to file a petition for renunciation at a US embassy or consulate. By the way, there aren’t any of those within the US. Seriously, do your homework here.
You’ve been listening to court lawyers too long. The government does not force an identity on you. You force it on yourself.
It is not possible for a US citizen (except in time of war, and only then with the Attorney General’s approval) to effect a renunciation of citizenship with legal effect while in US territory. Period.
http://www.law.cornell.edu/uscode/8/usc_sec_08_00001481----000-.html
Identity is forced upon you:
http://www.law.cornell.edu/uscode/8/usc_sec_08_00001401----000-.html
This becomes tedious…
(22) The term “national of the United States” means
(A) a citizen of the United States, or
(B) a person who, though not a citizen of the United States, owes permanent allegiance to the United States.
http://www.law.cornell.edu/uscode/8/usc_sec_08_00001101----000-.html
I didn’t find the definition of “person”. “Person” could mean anything for all I know.