I don't see why displays of religion should be protected at the workplace. Be a Muslim or Christian or whatever, but if you shouldn't be guaranteed the right to play dress up at your place of employment.

If an order of the Pastafarian religion claims they must dress up as the Batman, do employers have to allow people to dress up in a mask and cape?

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof;

How does the first amendment apply to private enterprise?

Title VII of the Civil Rights Act of 1964, which prohibits religious discrimination in hiring

The SCOTUS ruled 8-1, with Thomas the only dissent.