The meaning of all that is both profoundly simple and vastly complex. But leaving most of those things aside, what do you think of the following physical evidence of God:
The Christian church, which the Bible actually calls 'the Body of Christ', is a form of God (specifically Christ) on earth, and so 'proof'.
Note that Christianity is the largest, most powerful, one of the oldest and possibly fastest growing movements in human history. Is this at least some grounds for making its claim to be 'from God' a serious, if possibly arguable, contention? And isn't it a kind of physical proof of God?
Eh, I dunno. Maybe I'm misunderstanding what you're getting at though. Are you making the argument that the some of the things in the Bible are evident from the changed lives of converts to Christianity? I'm not sure that that constitutes 'physical' evidence, but maybe my idea of physical evidence is too narrow - mainly documentation/archeological discoveries and that sort of thing. Do explain though, please, I'd love to hear you elaborate further on what you meant by the above. :)