Reincarnation - anybody else spent some time in India?
An entire religious civilization built upon the belief of reincarnation. Very ugly. Very cruel. A grossly unrighteous caste system where the "untouchables" at the bottom deserve their plight as they did bad deeds in previous lives.
The only escape from the caste system is to convert to Christianity or Islam. And even then the Hindus will burn you and kill you.
Reincarnation is not a religion based on love, grace and forgiveness.