Is that really your argument? That basketball arenas hold 20k and thus the Ravens would only draw 20k because the other 50k are all busy observing Rosh Hashanah? That the NFL opener would be at any risk of being blacked out? Over a religious holiday that 90% of Americans wouldn't even know was occurring that day unless someone told them?
I picked those examples because those are the major sports leagues that are in season on Easter.
I'm not even saying that minority holidays should be given no consideration, but if Thursday doesn't work thanks to the logistics of having an MLB game next door, it's the obvious solution.