Where do agnostics go when they die?
Back to the earth. If a body is not cremated, the body becomes food for microbes as it rots. All that goo then seeps out of casket and into the soil - which becomes food for plants, earthworms and other creepy crawlies. Eventually, those plants, earthworms and other creepy crawlies become food for bigger animals or become fertiliser for bigger plants. Those bigger plants and animals eventually become food for humans. Humans uses those foods to make more babies.
Neil deGrasse Tyson says it better.
We ascend to heaven to dwell forever in the house of the lord. ...um wait, I confused that with a plaigerized myth designed to control the masses and bring power and wealth to the elite. We don’t go, we stop... when your car dies it’s still there. We are caporal beings... primates, do you think there is a monkey heaven? Because we are smarter but still basically a monkey, we are smarter but not always wiser.