Most employers (since that seems to be the problem here) will be reasonable about your religious beliefs, even if you aren't Christian or Jewish!!! Other stuff, i.e. prison as Cartoons! raises is that most people don't give two shits about prisoners because, quote frankly, they are there for a reason, and I wouldn't want to see my taxpayer dollars going to pay for a serial killer or rapist to have a special meal or accomadations on a menu in prison. Most people probably feel the same way.
@ Network: I can't think of a single Jewish holiday that is nationally recognized. Tbh. Most of the Christian holidays are nationally recognized because this country was founded with basic Christian ideas in mind (regardless of what someone wants to tell you) and because the majority of the population is Christian and has been that way for some time.