Sometimes we can look to fiction for insight into perplexing phenomena. Sherlock Holmes explained that most obvious evidence is often the most likely to be overlooked. To me this explains why so many who are religious cannot accept what others see clearly. It applies not just to Christians but to religions around the world.
When people are born into a family or society which believes a certain god is not a product of imagination but an actual being they likely acquire a belief not only in a god but in that particular god. They are surrounded by belief and cannot fathom the invisible being is not actually there. That it is present in other minds as well as their own makes it seem tangible and real.
What is right in front of them, however, is the obvious. If no one has ever seen the god, nor seen evidence the god can deliver what it is said to promise, odds are strong there is no god.
Another place Sherlock Holmes could help us is with abortion. The prevailing view among anti abortion zealots is the fertilized egg is a human being. If a detective like Holmes looks for evidence this is true, he/she will come up empty. There is but one conclusion available, the fertilized egg is not a human being.
As Holmes said, “Once you have eliminated all of which is impossible, then whatever remains, however improbable, must be the truth.”