Here’s an interesting thought experiment, especially for Christians. Imagine, for a moment, what the world would be like if Christianity were a myth. How would it be different?
People would not suddenly become omniscient, would they? Of course not. Why would God’s failure to exist suddenly improve our mental abilities? A world in which God was a myth would still be a world where people don’t fully understand the world around them. That means believers would still have plenty of opportunities to superstitiously ascribe things to God, and to defend their faith by pointing to things and saying, “You can’t explain that!” Even if God never existed, we could still have creationists and philosophers building detailed apologetics out of what we don’t know.
Coincidences would not stop happening, would they? Of course not. The world is a complex place, with complex and subtle interactions. We can’t trace back every chain of cause and effect, even for relatively simple processes. To follow all the complex social, economic, and physical factors that influence our lives would be humanly impossible. We can’t predict our own futures with 100% accuracy, and consequently we will not uncommonly encounter things we didn’t expect. There would still be plenty of room for superstitious people to take those unexpected outcomes and call them “miracles.”