The odds of radical Muslim fundamentalists taking over America and imposing Sharia Law on it are about the same as dogs taking over the world, and forcing humans to do nothing but produce dog biscuits.
All told, Muslim-Americans make up around 1% of the US population, or around 3,430,000. And the percentage of them who want to scrap the Constitution and other fundamental American principles for "Sharia Law" and Islamic theocracy is about the same as the percentage of Christian-Americans who want to scrap the Constitution and its values for Biblical Law and Christian Nationalism.
Say, 10% of both religions in America.
Unfortunately, Christians all told make up around 60% of the total US population of 343 million, or around 206 million, which makes the 10% who are Christian Nationalists -- 20.6 million -- very much a danger to liberty, democracy, and pluralist/secularist Constitutional principles.
BTW: What exactly are these "Judeo-Christian values" that our government is supposedly based on?
I've been trying to get an answer to that all my life, yet no Christian or Jew I've ever asked can give me a reasonable one that makes any sense. In fact, "democracy" is a pagan Greek invention, while the concept of a "republic" is a pagan Roman idea. And our legal system is based on pagan Germanic Anglo-Saxon concepts.
Meanwhile, Christianity has always been about dividing power between a Church and a monarch. Individual rights and freedom of thought and expression have always been anathema to it.