It’s not against the religion to cremate someone, it used to be forbidden but it’s changed now and as long as the ashes are kept in a certain way then it’s acceptable. I think most do bury though I don’t know any catholics who do cremate but then I don’t know all catholics on the planet so who knows what the thinking around it is, but I think devout catholics don’t usually cremate.
Because it’s not usual practice people were making leaps about why he cremated the children saying that he needed to be rid of any evidence so they couldn’t be exhumed.
So many things about what happened just don’t make sense and it’s just another thing, PC family seem to be religious so it’s surprising they went with cremation. However I only know that his mother is religious PC might not be religious at all and that’s his preference, there’s nothing wrong with that.
Religion has been brought into the trial from the prosecution, asking his mother about her faith and if she knows murdered is a mortal sin. One of the prosecution witnesses also talked about religion, he brought up mortal sin too when talking about LC and her religious beliefs.
I think the prosecution brought it up for the jury though, maybe hoping one or more jurors would be religious and sway them that way. I can’t see the benefit of asking PC’s mother if she knows it’s a sin as I’m sure she does, most people know it is whether they frame it as a religious sin or not they know it’s an abhorrent act.
edited to add I am not catholic it’s only my understanding of the religion and its practices