You ask for a day off for religious reasons so you can observe Yom Kippur.

That there is no company-wide shutdown for a holiday observed by 2% of the population is not some great injustice that requires waging a culture war in the office to remedy.

I think you're missing why people's religion and race matter in the work place. Asking for a day off for religous reasons is bringing religion into the workplace.

When people say "bringing religion into the workplace" they are usually thinking about setting up an office Christmas tree or hosting prayers before meetings. Reasonable expressions of religious sentiment such as wearing religious attire, praying silently to oneself before meals, and taking leave for religious holidays are generally not included. The boundary line is usually drawn at "does this pressure coworkers to act in accordance with specific religious beliefs."