Is God Just a Way of Solving a Mystery by Appealing to a Greater Mystery?

Questions about whether God is just a way of solving a mystery by appealing to a greater mystery, whether subjective experience falls under a category of knowing, why people in the Bible got to hear and see God but we don’t, and an analogy between God and Hitler.  

• How would you respond to Matt Dillahunty, who says that God is just a way of solving a mystery by appealing to a greater mystery?
• Does my undeniable, subjective experience of God fall under a category of knowing in epistemology?
• Why did the people in the Bible get to hear and see God while they were alive, but we have to die first?
• How would you respond to someone who asked, “If a Jew during the Holocaust was spared the gas chamber in favor of spending the rest of his life with Hitler, would he call that Heaven?”