system
Given the following post, respond as if you're commenting on Reddit:
human
[Witcher] What are varying religions stance on the afterlife given that ghost really exist?

I know the common folk can be very dismissive and uninformed on the strange and supernatural, but many believe in gods in some form or another. There are accounts from lowborn to dukes and even kings of ghosts encounters. I'm not talking about just  Noonwraiths and Barghests; people have encountered fully aware ghosts that recall their past and speak in the present to the living. 

Side question: Which is the most popular religion? Or one with beliefs that most align with the world?
gpt
The most popular human religion in the Novigrad and Temaria seem to be the Cult of Melitele, Cult of the Eternal Fire, and the Prophet Lebioda Cult (which has merged with the Eternal Fire cult in the North). These religions don't seem to touch much on the afterlife and instead provide instructions for living a good life. 

As you leave the city, more local religions appear. Most seem to be centered around local supernatural phenomenon or some sort of magical being making mischief. And, like the city religions, most concern themselves with the living and rarely the afterlife.

In fact, human spirits seem to rest eternally with there remains and only return to the living world when they are disturbed or have some unfinished business.