This is a difficult question to answer, as some people have seen God in the presence of others but many others have not. If you have had this experience, you can write about it on a personal level, but if not, you can focus on moments others have recorded. The most famous would probably be in Acts 2:3-4 in the New Testament. Here, Jesus' disciples had a group experience of God descending in the form of the Holy Spirit. As the disciples were gathered together in a room, God appeared as tongues of fire and in his presence, the disciples began to speak in "other tongues." While we can't scientifically verify that this actually happened, a group of people experienced it as real. This moment traditionally marks the beginning of the Christian church, because its power transformed the disciples from a frightened band who had lost their leader to a group with a vision and direction based on their direct experience of the divine.