Can I ask why?
I've heard some people argue it's because religious views can conflict with a job, but if that's the case, the issue is the employee's not doing their job not their religion. Lots of beliefs can conflict with a job, and if that's the case, a person has to decide whether they want to keep their job or not.
Another argument is that simply the presentation of religious symbols in public is offensive to some, but that seems to be an extreme version of "Safe Spaces" while just skipping over tonnes of preceding steps.
Also, it seems convenient the whiter the religion, the less likely their are to require their worshipers to wear expressions of faith. On the other hand, religions like Islam and Sikhism that just happen to be practiced by more brown people require outward expressions of their faith. So a Christian who is super faithful, goes to mass daily and spends all their free time in prayer can work for the government as long as they keep their cross under their shirt, while a Sikh who might not be all that religious has to decide if they want to risk being shunned from their community.
P.S. Separation of church and state means those organizations shouldn't influence each other, not that individuals can only be involved in one or the other.
I agree with your reservation about Manjaro. However, you did get one thing wrong:
That was Pop!_OS (unless it happened a second time??)