I was away for few days but will shortly answer how God is proven outside physics:
* thousands of known records/testimonies of people healed by God (even the incurable diseases by current medicine technology)
* hundreds records/testimonies of people who visited Hell or Heaven (or both)
* thousands people delivered from various psychical diseases or serious addictions by God
* over 2000+ fulfilled prophecies up-to several hundreds years in advance
* personal testimonies preserved in Bible and some other records 
* facts in Bible  considered false for many centuries and verified by modern science and archeology since 20. century
* everyday experience of God in lives of many millions of Christians all around the word