What was to happen to Moses because of his son's uncircumcision? Was God going to kill him, or simply exile him?
Exodus 4: 24 - 26
And it came to pass by the way in the inn, that the LORD met him, and sought to kill him.
Then Zipporah took a sharp stone, and cut off the foreskin of her son, and cast it at his feet, and said, Surely a bloody husband art thou to me.
So he let him go: then she said, A bloody husband thou art, because of the circumcision.
Refer also to Leviticus, where "cut off" and "put to death" are used interchangeably.
Leviticus 20:1 - 6
Then the LORD said to Moses,
“Tell the Israelites, ‘Any Israelite or foreigner living in Israel who gives any of his children to Molech must be put to death. The people of the land are to stone him.
And I will set My face against that man and cut him off from his people, because by giving his offspring to Molech, he has defiled My sanctuary and profaned My holy name.
And if the people of the land ever hide their eyes and fail to put to death the man who gives one of his children to Molech,
then I will set My face against that man and his family and cut off from among their people both him and all who follow him in prostituting themselves with Molech.
Whoever turns to mediums or spiritists to prostitute himself with them, I will also set My face against that person and cut him off from his people.
OK let's assume "cut off" includes putting to death. That would accomplish the same thing, ie. a soul being cut off from God's people and promises. In the covenant of circumcision God promised to be the God of those who obeyed the covenant and to give them the priviledge to live in the land. So those who didn't obey it were not his people and not inheritors of his promise in the land