Meh, when you’re dead… you’re dead. No spirit world. It’s hard to shake that belief because you want to hold onto something after they’re gone.
Most of my life I’ve never believed in any of that afterlife crap any more than I believed Santa was real. Then in 2003, my dad passed away. We were pretty close. I found myself thinking I could feel his spirit for a year of so afterwards. Then I came back to reality and realized that it was mostly my not wanting to let go.
Composting sounds like a carbon neutral way to deal with body. But I think I read somewhere in Missouri there is a natural grave location where you can be buried without embalming and all that other crap. Just wrap a cloth around a body and put it into a grave located in a meadow (W/O any markers) to decompose naturally. I think it was more of a shallow grave so the insects could do their job better. Either way would be fine with me.
My oldest sister donated her body to medical science/research. I asked her a couple of times if she really wanted to be dissected like a frog in a high school biology class. She said if she could be of use, she didn’t care.