The difference is, in our country the fanatics are religious, not athiest. As long as we have 50%++ of this country that is willing to base public policy on 2000 year old adopted, translated, adjusted manuscripts, I don't think anyone will outlaw religion.
And the "liberal elites" don't want to outlaw any free speech. I don't fear that what happened in the Soviet Union will happen here anytime soon. I do fear that the religious right will play a key role in stripping our civil liberties, punishing politicians who are not religious, forcing their ideals on our schools, courthouses, medical research policy, zoning laws, etc, etc, etc.....Oh wait- that already happened....