That's still an imminent threat. Just like holding the remote to a bomb. You aren't holding the bomb (the actual weapon) but you can immediately cause it to explode.
Being an enemy combatant once again doesn't supersede your constitutional rights.

No. Marriage predates government by several thousand years.

Marriage existed long before governments recognized it and tried to regulate it. Its literally older than any modern government.

No, it recognized the inalienable right to bear arms (which is one person operated weapons) and helped protect it.

Over 2.5 million lives are saved in the US per year due to guns according to Gary Kleck and Marc Gertz's 1995 National Self-Defense Survey or the 2021 National Firearms Survey.