That’s not a bad thing in itself. We have experiences and we’ve been taught things about the world, and we use this information from our past to help us understand what we experience in the present and what we expect from the future. We will never know everything there is to know about any event in our lives or that we read about, but we make assumptions about things that we can’t see based on what we have seen in similar circumstances before.
If you see a masked figure running from a bank, the movies you’ve watched, the news you’ve read, and your personal experiences with masks and banks will probably lead you to assume that the person has just robbed the bank. You’d probably be right.
Without assumptions, we’d be paralyzed by every new event. We would never be able to make decisions about anything because we’d have to analyze every detail and every detail about those details.
Unfortunately, our assumptions aren’t always right. Maybe there’s an employee costume party going on at the bank or the running figure was a horribly disfigured man late for an appointment with his plastic surgeon. Neither explanation seems likely, but they’re both possible.
The farther a situation is from our personal experiences, the more likely it is that our assumptions about it will be wrong. The passing of only a few decades or a few thousand miles can mean dramatic cultural changes.
Consider the differing experiences of farmers across the world in the same year. The work of a coffee grower in Indonesia, a Chinese rice farmer, a corn farmer in Iowa, and a greenhouse grower in Massachusetts has significant similarities. They plant, cultivate, harvest, and sell, but the differences are also significant. One might be a technician with an advanced degree in botany or biology, while another might be an illiterate slave. They speak different languages, use different tools and methods, have different values, follow different growing seasons and development cycles. They would not use the same vocabulary to record their life stories, nor the same metaphors to communicate their thoughts about God.
War, mass migrations, changes in language, economic conditions, technology… the potential complications can get…um…complicated. Now, extend that across thousands of years, a hundred generations and dozens of genocides, the rise and fall of empires and religions.
Welcome to Bible study.
The Bible was written over the course of 1500+ years, in multiple languages, by people with vastly different personal experiences and assumptions about the world. When you read it, you need to be aware of the historical, cultural, linguistic, and personal context of the original text, and even more aware of your own presuppositions.
If you approach the Bible wearing your modern American assumptions over your eyes, you are going to see much that isn’t there, and you will miss much that is. Your study will tend to reinforce what you think you already “know” rather than reveal what actually is.