When I was a child, a really old lady (who lived another 30 years, so why I remember her as really old, I don't know :)) asked us how we knew we had a toothache - because you can feel the pain - how do other people know you have a toothache - they can't see it or feel it - they have to believe or take it on faith - just like you have to do with God.
It stayed with me - and as now a person of science - its still there, how do we know what we know to be true.
Unless you have certain types of experiences.
Then it's more like being hit by a sledgehammer rather than "taking it on faith".
