The Mormons do not “have versions of this.” Their official policy is quite the opposite. However, for many Mormons, their religion is their whole identity so when a family member chooses another lifestyle they are personally offended and can’t find any way to relate to them anymore.
The income percentile you were born into. So those at the lowest income levels have the highest probability of surpassing their parents. But all probabilities seem to be decreasing each generation.