Why did God appear on the mountain? To give His law to the people! And why did He appear in a fire? Because what is from this world cannot escape fire. Because there is nothing in this world that can survive in the presence of God! Therefore, we either obey His word and may have fellowship with God, or we disobey, but then His fire consumes us.
The key to our relationship with God is obedience. This is how we can get closer to Him, not through our emotions. Yet many choose the emotional path, so there is more praise in the place of obedience, and more prayer in the place of deeds. There is confusion in Christianity because they try to understand God through emotions.