What Happened to "Separation of Church and State"?

I know, I know---separation of church and state is NOT in the Constitution. So how come Sharia law (religious law par excellence) is okay?

The Constitution states that the government cannot create a state religion. Everyone can freely pursue his or her own religious beliefs without coercion from the government.

However, this little statement from Jefferson's writings has been used repeatedly over the years to make sure the Ten Commandments aren't posted in courthouses, schools celebrate "Winter Holidays" instead of Christmas, manger scenes aren't allowed on government property, etc., etc., etc.....

In Florida, a judge, Richard Nielsen, has ruled that a dispute over mosque property should be resolved using Sharia law.

I've been following this for several days, wondering exactly what was going on. Were the opponents wanting to go to arbitration under sharia law? What was up?

In fact, at least one party feels that the legal wrangling should be solved using Florida state law. It is the JUDGE who is insisting on the use of Islamic religious law over state or federal law!