Do you think it is relevant that the evil spirits know Jesus and the disciples did not?

Relevant? I don't know.

Evil spirits had once been in with God from their creation as angels. Once Lucifer fell and took one-third of the angels with him, they became demonic forces. Evil spirits. Unclean spirits. There purpose seemingly is to torment humanity. But they had once been in the presence of God - knowing exactly who he is, seeing him in his full glory and power, and yet choosing the devil.

They recognized Jesus as God and God's Son because this was not their first time to be in his presence. And they apparently know their future fate.

The disciples, having never been in the presence of divinity before and seeing Jesus in the form of a man, struggled with understanding who he was. Over and over the bible says, they "didn't understand" or "wouldn't ask him what he meant". Even Peter, who confessed who Jesus was via the power of God didn't fully get it until after the Resurrection.

 

“The Nephilim were on the earth in those days (and also after this) when the sons of God (descendants of Seth) were having marrying the daughters of men (descendants of Cain), who gave birth to their children. They (the children) were the mighty heroes of old, the famous men.” (Genesis 6:4)

“And there we saw the Nephilim (the sons of Anak, who come from the Nephilim), and we seemed to ourselves like grasshoppers, and so we seemed to them.”” (Numbers 13:33)

נְפִילִים - a derivative of the Hebrew verb root n-ph-l (נ־פ־ל) "fall" - a Hiphil causative stem meaning that the nephilim are "those that cause others to fall down" IE great warriors, men of renown, or famous warriors.

 

The Magi knew he was king because because they knew of prophecy, but primarily because God's star literally pointed to him. If 10 babies were put in their presence, they could not have picked him out. The star led the way and then stopped over where Jesus was.

Simeon knew because the Holy Spirit told him that he would see the Messiah and the Holy Spirit moved him to the Temple that day for that purpose. As the Magi had been led by the star, knowing whom they were looking for, Simeon, knowing whom he was looking for was led by the Holy Spirit. Anna knew, because the bible says she was a prophet and she heard Simeon reveal who Jesus was and went over "at that very moment." Anna was also looking for the "redemption of Israel".

The Magi, Simeon, and Anna knew whom they were looking for. God supernaturally revealed Jesus to them as the king, the Messiah, the redemption of Israel. All by themselves, they would have never recognized him.

The demons had been in his presence before.

The disciples, Jesus' own family, the Jewish leadership, Pilate, Herod, and others had no idea of who Jesus was. Some had a preconceived and incorrect understanding of Messiah and others had no idea God was even real let alone sending a Messiah.

 

There is none. It is a made up "doctrine" to avoid the obvious implications of what happens when the saved (sons of God) are unequally yoked in marriage with the unsaved (daughters of men).

That breakdown removes God's hand of blessing from the family which results in violence, hate, rebellion, and war, and raises to fame those offspring who commit such violence.

Kind of reminds you of today, doesn't it?

 

No, the sons of God are the sons of God, not demons or of the devil. The parallel nature of that portion of Genesis is obvious. The descendants of Cain are contrasted with the descendants of Seth, resulting in the breakdown of God's command to be separate from inequity, and the great evil that resulted.

There is absolutely no exegetical reason to identify the "sons of God" with demons.

 

The nephilim were not physical giants. They were giants of reputation, "men of renown" - great warriors.

Remember that all this takes place before the flood of Noah. Unless you think the progenitors of Anak stowed away on the Ark, then Anak and his descendants were simply on the large end of normal human variation.

(My daughter is 5'6" - her husband is 5'10" - their 18 year old son is 6'4" and their 15 year old son is 6'3" - normal variation in the human genome.)