The Muslim travel ban attempted by Donald Trump in the 2016 election and then via executive orders will be argued in the US Supreme Court: https://www.yahoo.com/news/travel-ban-case-justices-first-dive-trump-policy-044621903--politics.html
Some new information re the Sharia law scare: https://www.opensecrets.org/news/2018/04/exclusive-robert-mercer-backed-a-secretive-group-that-worked-with-facebook-google-to-target-anti-muslim-ads-at-swing-voters/
The root of the Muslim ban goes back to the 2016 campaign and it reflected fear of anything Muslim and Islam that has been brewing among a segment of our population . Fear of terrorism is one factor. But since at least 2004 a wave of fear spread across the South that Islam's religious Sharia law would soon be coming to their state.. That has been one element feeding that blanket hatred of anything Muslim and a desire to keep their followers out of the US. Fear of Sharia is a form of Islamphobia that cropped up again in Grand County with a controversial speaker recently at Constitution Week in Grand Lake. as reported in the Sky Hi News (http://www.skyhinews.com/news/controversial-speaker-during-constitution-week-talks-islam-sharia-law/) The story resulted in a heated exchange of letters to the editor, attacking and defending the point of view expressed at the event.
The "establishment of religion" clause of the First Amendment means at least this: Neither a state nor the Federal Government can set up a church. Neither can pass laws which aid one religion, aid all religions, or prefer one religion to another "... That decision works two ways: Sharia laws clearly cannot be established as the law of our land and state laws attempting to ban Sharia law have been ruled by courts as unconstitutional because they harm Muslims or are redundant.
Banning Sharia law has been a hot topic in legal and political circles, and often fueled by fear of Muslims. Anti Muslim sentiment erupted in the 2016 election in the form of Trump's Muslim ban. Its chief anti-Muslim fear and cheer leader was Mike Flynn, the general who briefly served as Pres. Trump;s national security advisor, but was fired for not being truthful about conversations with Russians. It later was learned that he was working for the Turkish government, ironically a Muslim country.
Our Islamphobia makes us vulnerable to being duped by adversaries such as Russia. .As we have learned through news reports and Congressional hearing testimony , Russians saw an opportunity to weaken US world influence, sow internal dissent and hatred, and interfere in our elections by hyping anti- Muslim hysteria that supported Donald Trump's anti Muslim oratory. One tool the Russians used was social media to organize a Muslim hate rally in Twin Falls, Idaho in 2016. A Russian originated Facebook site promoted an anti Muslim rally in Houston, last year, as well, posing as a Texas organization.
The PEW poll can be found at http://www.pewresearch.org/fact-tank/2017/08/09/muslims-and-islam-key-findings-in-the-u-s-and-around-the-world/
Everson v Board of Education explanation source: Wikipedia Search Sharia Law in America for more details about States' attempt to ban Sharia law.