An important piece I came to understand prior to my conversion was that my standard of proof was completely unrealistic. I wanted airtight proof before I could believe in God, and I came to realize almost none of the things I knew in life enjoyed this kind of support: my name, my date of birth, the reality of the outside world, the existence of other people, and a multitude of other things I was yet fully rational in believing. So my expectations about God suffered from a double standard.
I don’t know if there’s a God. (And neither do you, and neither does Professor Dawkins, and neither does anybody. It isn’t the kind of thing you can know. It isn’t a knowable item.) But then, like every human being, I am not in the habit of entertaining only the emotions I can prove. I’d be a unrecognizable oddity if I did.
― Francis Spufford
Unapologetic: Why, Despite Everything,
Christianity Can Still Make Surprising Emotional Sense
It is as impossible for us to demonstrate the existence of God as it would be for even Sherlock Holmes to demonstrate the existence of Arthur Conan Doyle.