text: "Let me see if I understand you. You think Islam should be banned because Sharia Law violates the Constitution"
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  Correct.
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  "How does that work?"
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  Sharia Law and its practicioners believe it overrides any government law or agency, and supersedes any enforcement statues which the Constitution would guarantee- it is based on ancient Muslim tribal law, is barbaric, and has no place in a modern, Judeo-Chrstian, Western, Industrialized Democratic Republic.  Does this clarify?
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  "How can the government tell people what [not] to believe "to protect them from Sharia Law""
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  They're not- they're banning Sharia Law.  That's not the contractual law we subscribed to when our Founding Fathers crafted the Constitution.
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  "Many forms of Christianity and Judaism have rules that would be unconstitutional if the government enacted them."
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  Which is why they don't. And is also why Christians don't enact their own courts, their own police force, or their own tribunals- which is what Sharia Law is.