What does the Spirit tell you about it?
And there are three that bear witness in earth, the Spirit, and the water, and the blood: and these three agree in one.1 John 5:8 (water=the Word; the blood brings us the grace of the gift of righteousness).
All three should agree as we follow the life and peace of the Spirit.
I'm not sure I see Nephilim re-appearing in scripture in the last days. I do see in scripture, especially after the rapture, the very swift ("swift" symbolized by the four horses) rise of Worldwide Jihad and Islamic Supremacy and lots of blood and beheadings ("sickle" = Islamic "sword"). I think the beast (the "12th Imam" Islam is waiting for) is an Assyrian.
Not sure Satan needs Nephilim when he's got the Islamocrazies doing his bidding.