Should the Europian Union officially ban the Sharia law against the local laws?

You don't see that it is too late.

And this author is I think an atheist

The New Vichy Syndrome: Why European Intellectuals Surrender to Barbarism

by Theodore Dalrymple

https://www.amazon.com/New-Vichy-Syndrom...

He is right

Western Europe is in a strangely neurotic condition of being smug and terrified at the same time. On the one hand, Europeans believe they have at last created an ideal social and political system in which man can live comfortably. In many ways, things have never been better on the old continent. On the other hand, there is growing anxiety that Europe is quickly falling behind in an aggressive, globalized world. Europe is at the forefront of nothing, its demographics are rapidly transforming in unsettling ways, and the ancient threat of barbarian invasion has resurfaced in a fresh manifestation.

Today’s Europeans no longer believe in anything but personal economic security, an increased standard of living, shorter working hours, and long vacations in exotic locales.

The result, Dalrymple asserts, is an unwillingness to preserve European achievements and the dismantling of western culture by Europeans themselves. As vapid hedonism and aggressive Islamism fill this cultural void, Europeans have no one else to blame for their plight.

Problematic. Would this create a defense that the existing local law is sharia and thus unenforceable?

The Sharia is not jet in EU.