"On which basis, Steve, your view would be that nobody should ever believe anything. But of course, by definition, you don't believe that..."

Well, define " believe". Apart from believing that Liverpool are the greatest team on earth and that Bill Shankly was greater than God (and that's the truth of it, of course), why should I accept anything on someone else's say so? Well, I might trust that person implicitly, though that will come after a long period of knowing that person very well and seeing plenty of evidence of his integrity. There may be other occasions when the matter in question may be neither here nor there to me and I might as well take the assertion in question at face value in order to save time. But for anything important I want evidence. That doesn't make me Mr Spock. That makes me someone who doesn't care to be controlled or hoodwinked. I'll leave that approach to organised religion.