No souls, no afterlife. When you die you become wormshit.
Reincarnation is load of crock as well. People have no memory of past lives, and you can tell that the people who claim that they do are lying, because they always claim to have been someone interesting in a previous life, rather than just Random Peasant #N. Notice how reincarnation has never contributed to our knowledge of past history, even though by all rights it absolutely should.
I think there are enough examples of evil people leading good lives and good people leading poor lives to conclusively destroy any notion the universe has a karmic aspect. In fact the notion of karma can be used to shore up social injustice and unearned privilege, after all if there's some form of natural justice in the universe, then all those rich and powerful folks "must" have somehow "earned" their blessed position in life.
Your best chance of being revived after being declared dead is the cryopreservation of your body (or at least your brain), and even then, it's a long shot with no guarantees. I don't think the vast majority of people produce enough data about themselves to have a copy of their ego reconstructed in the future. As such, any ancestor simulations of this period in the future are very unlikely to be have the granularity needed to accurately recreate the individual lives of most ordinary people living now.