If a christian man is allowed to audition for a part, but a jewish man isn't, is that illegal?

i have reason to believe that, even if men had been allowed to audition at all, that, if they were allowing men to audition but ONLY christian men could, that, that is a form of anti-semitism. is this then, illegal?

If a christian man is allowed to audition for a part, but a jewish man isn't, is that illegal?
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