It is God's All Power that makes it impossible to look at his face and live. And his all goodness. Since humans are neither powerful enough, nor good enough to stand in the Presence of the All Powerful, the All Holy, the All Good, it is no wonder that we should be unable to survive the experience.
I do believe the Ark still exists. I expect it is under Mount Moriah, where the Temple was built, and on top of which now sits the monstrosity now known as the Dome of the Rock. It should either be disassembled and sent in pieces to Saudi Arabia to be rebuilt there, or it should simply be blown up, in either case, to make room for the restored Jewish Temple. And once it is removed, then further investigation for the the Ark can be done. It has been stopped by the Israeli Government because further digging would possibly damage the foundation of the Dome of the Rock. But without that monstrosity there, it would no longer be anissue, we could find the Ark, and then build the Temple AFTER having found it.
As re: the fact that God has chosen a nation as his own, and has at times in the past ordered that nation to destroy other nations, I do know that at first blush, that appears pretty brutal. But that is simply a fact of life. God decides what is moral, not us. Remember that these were nations who passed their children through the fire to Molech. They were nations who indulged in ritual prostitution. They were nations that used eunuchs as catamites to satisfy their men's unnatural lusts. Before getting too critical, I recommend you actually READ Exodus.
Any religion that poses a deity that has limited power is basically posing a deity that is no deity, as per Anselm's Argument from Ontology.