It's not that their food culture is backward. They just never bothered to develop fancy methods of cooking because they have an abundance of fresh and high quality ingredients. In our own history, a lot of fancy cooking techniques were developed in order to overcome food shortages by re-processing stale food or food that has gone bad, e.g. Thailand's tomyam, Korea's kimchi, Chinese fried foods, various types of Asian curries, etc.
A representative example of this is the Final Boss fight, where the MC had over-prepared to the point that he was able to whack the boss easily.
the MC has some prophetic powers, which we (and the MC) learn in the later parts of the story.
the MC is on a completely different evolutionary path than everyone else.
God's position was usurped by his archangels, and the MC's trials were almost all plotted by his "real" father. (Actual details redacted).