Answer:
It is an external conflict, a man vs. God conflict.
Step-by-step explanation:
An external conflict is when there is a clash or contrast in the interest of the character with something else. It could be with another character, an animal, nature, or even a supernatural being. It is when this other external being becomes or poses an obstacle for the protagonist to get to his destination or goal.
In the story of Abraham and Isaac, God asked Abraham to sacrifice his only son Isaac to him as a burnt offering on Mount Moriah. This is a case of man vs. God, as God posed or put an obstacle to the character of Abraham.