What seems to underly your question appears to be a belief that people are primarily rational creatures. If that were so, then it would indeed be hard to unde

What seems to underly your question appears to be a belief that people are primarily rational creatures. If that were so, then it would indeed be hard to understand. For most, if not all, rationality is a tool, not something that informs every aspect of their lives. Religion provides community, meaning, continuity and a moral framework. I have also met very few religious people who are fundamentalist in their belief. Most acknowledge there are inconsistencies and things they can't explain.