In short, if we assume that GOD is evil, lying, or unreliable, it means that we can no longer trust anything. Not the senses, not logic, not memory, not science, nor even the things that seem most obvious to us. If GOD deceives us, we can know nothing about anything.
Honestly, it really doesn’t matter if GOD is evil or not. But look at it this way. He created us—our minds and everything around us. This means GOD also created the Bible as a lie. We can’t know if our logic of good and evil is flawed. We can’t trust our senses or thoughts.
We can’t even believe in science. Why?
Because we wouldn’t know if we were wrong or that science is wrong. If he/she is evil or lying to us, we have no way of knowing this. In this instance, we’d need to distrust our own thoughts about our world and everything in it.