How can a good christian believe in separation of church and state?

As a devout christian I believe christianity should be a mandatory religion in America and all non believers should be burned at the stake. I am sorry but I believe that Gods law overides the constitution and our freedom of religion makes Americans slaves to the devil and false ideologies. America was founded on Christianity and I am gratefull that the native americans were slaughtered for not accepting Jesus. You may think I am a dictator but it states in the bible that people who do not believe in Jesus will be cast into hell. Do you want to call God a dictator? I am not here to judge like so many of you believe I am but I am plainly stating what has been written in the bible.