A friend of mine (retired dentist, former research chemist) is all for this and is planning on having himself composted once he goes.
I think it’s odd but if that’s what he wants, more power to him. It’s not like he’s using the body anymore.
Remember, we HAVE a body, we ARE a soul. The body is merely a temporary container.
Yes and no. Your body will be resurrected like Jesus Christ’s was. At that point you will either be cast both body and soul in hell, or you will be body and soul with Jesus Christ.