Not really curious no. Cemeteries that are public can’t discriminate. If they sell plots, they have to admit anyone. This would be covered by the civil rights act with regards to public accommodations, I’m guessing. A privately owned cemetery has more latitude, including those owned by churchs, etc. But if they sell to the public, they have to admit anyone.
But why someone who is not a part of a religion would be upset about not being allowed to be buried in the private cemetery of religious institution is beyond me… Same for a private family cemetery. 
It’s not remotely the same thing as systemic discrimination that created the concept of racially segregated burial. If you (assuming you’re white) can’t be buried next to that little church on the corner, you have plenty of other options for burial, including your local public cemetery. In racial segregation, your options for burial often precluded that for non-whites. Apples and buicks.
