Mark’s gospel, the earliest account of Jesus, wasn’t written till 30 years after Jesus was gone. Plenty of time for the resurrection and all the miraculous events attributed to Jesus to be fabricated in order to make the narrative more compelling. The original purpose of the gospels was to attract converts. Jesus—like the Buddha—left nothing in writing. And there are no known contemporaneous accounts of Jesus’s life.
The fact that people’s lives and behavior have been changed by spiritual belief is not evidence that such belief is uniquely true. A co- worker of mine felt reborn when she discovered Scientology. And she tried to recruit us.
Just because we don’t have an explanation now doesn’t mean we never will. Consider the state of knowledge 300 years ago. In 1721, Isaac Newton was still alive. He discovered the mathematical formula to calculate the force of gravity between 2 masses. But did he have a clue that gravity is a distortion by mass of the time-space continuum? Or that mass is acquired by matter interacting with a boson in a Higgs field that permeates the entire universe? None of us can imagine can imagine what we may learn 300 years from now.
Your post is the argument from incredulity. You can’t conceive of how the universe and all it contains could have appeared by natural processes. This is a primitive form of thinking, which humans have always done. We’ve always attributed what we didn’t understand to the actions of gods, spirits, or other supernatural entities. Yet as our knowledge has improved, a supernatural explanation has never been shown valid for anything. So, by simple inductive reasoning, why should I believe the Bible God—or any god—is the answer to the many things we still don’t understand?