and never fear the US government.
Keyword is "US government". Most likely, after demonstration of such level of stupidity, you will be attacked by some non-government bodies, and forms of attack may vary widely. The more influental figure you are - the more attention and resources will be allocated by jewish lobby to shut your mouth.
And I cannot for sure point to any EU country where you will be able to publicly say that without prosecution from government. AFAIK, Spain, Denmark and Norway is not criminalised denial of hollowcaust per se, but interested parties always can shake their peisy and find some "hate speech" law to make you lots of troubles.
In Russia - Article 354(1) of Criminal Code, «Rehabilitation of Nazism». Responsibility has been established for the denial of the facts established by the verdict of the International Military Tribunal for the trial and punishment of the main war criminals of the European Axis countries, the approval of the crimes established by the specified verdict, as well as the dissemination of knowingly false information about the activities of the USSR during the Second World War committed publicly. In particular, this verdict established the fact of the extermination in the period 1933-1945 of 6 million Jews throughout Europe, later called the Holocaust.
While I (as engineer) doubt about physical possibility to burn declared number of dead bodies (= number of declared victims minus number of remains found in a mass graves) with amount of fuel and equipment that nazis probably had available in "extermination camps", I prefer not to discuss this matter on public. I have lots of more interesting things to do, compared to defending myself in a criminal court.