My family is roman catholic and we believe that your soul, if it exists, is not attached to your body. People involved in things like Hiroshima can have their body completely destroyed, but their soul can still go to heaven. My grandmother was incinerated and her ashes are somewhere downstairs because we know that what happens to her body really doesn't matter.
Those plots of land set aside for cemeteries do nothing for the dead and I don't mind seeing them destroyed because they shouldn't exist in the first place. If we had a grave for each of the billions of people who have died, earth would be nothing but graves. From god's perspective, it would probably look like Sim City 3000 when you put a block of residential and the asshole sims put up a bunch of abandoned buildings instead of houses.
Catholics ignore most of the old testament because it has morals that no longer apply to us. It literally says that wool and linen cloth should not be blended together (ie your shirt is 70% cotton 30% polyester, that kind of blending). It literally says that you're not allowed to eat most of what is served at Red Lobster because things like lobsters and crabs do not have scales or fins. We accept that morality changes over time. Eating a pig may have been illegal 2000 years ago, but nowadays we don't care. Similarly, owning a slave in the US 200 years ago was perfectly legal, but now it's not (damn liberals).
I take it you haven't read the bible before.
King James Bible, Samuel 1, Page 15:
God explicitly told them to destroy Amalek. Kill all men, kill all women, kill all children, kill all of their animals. Spare nothing.