I'm not sure what to make of somebody unwilling to see that they are the same attitude, which is that what I want matters and needs to be protected, but what you want doesn't. This Christian doesn't care what impact his demands have on the workplace any more than the anti-vaxxer who insisted on working unvaxxed.
Anti-entitled attitude, which includes the expectation that simply because one claims that his religious beliefs are not being respected that others should accommodate them. No. If you want the freedom to insist on Sundays off, find somebody willing to hire you under those conditions or become self-employed. For me, freedom of religion is confined to the personal space. One is free to believe whatever he likes, read whatever holy book he likes, pray to whatever god he likes, say grace around the table, gather with like-minded people to reinforce one another, and decorate one's house, car, body, or business as he likes. If you insist on more, you insist on too much. But when you're in the public space in a secular society, you conform to its mores. If they say you need to work Sunday to hold a particular job, you work Sunday or find work elsewhere rather than insisting on rights you don't or shouldn't have. America doesn't exist to cater to the religious. It tolerates them.
But the faithful should worry not. The present Court leans theocratic. And you are correct. Pagan holidays aren't accommodated in the workplace. Your employer is not required to bend to your self-imposed limitations if you have any. Pagans are free to do whatever they like as long as they keep it in their personal space and obey the laws of the land. I doubt you expect more. This Christian litigant does. Why should such people get more?