An atheist has recently asked me to briefly describe an experiment by means of which God’s existence can be demonstrated. In reply I have to write to him that God’s existence cannot be demonstrated in this way, however God’s presence can be detected. For that purpose we will have to first posit that there is a God. But before positing any God we will have to first define this God, because there are many religions on earth and each religion has its own concept of God. So who's God to posit here? Now when we utter the word ‘God’, what do we mean to say by that word?