The point of Christianity is that if you can convince people that they shouldn’t expect any rewards until they die, you get a really compliant set of workers and soldiers who will let you impoverish and mistreat them because “the meek will inherit the earth.” You know, after your value has been fully extracted by the owners.
More broadly that’s the utility of all monotheism. It is extremely effective at uniting people but also teaches them to abide by an authoritarian hierarchical framework.