Here's what I quoted.

Thank you DL. I found it in my copy.

I've been reading the Books of Enoch and came across this in the Parables of Enoch, 69:4;

4. The name of the first Jeqôn: that is, the one who led astray ⌈all⌉ the sons of God, and brought them down to the earth, and led them astray through the daughters of men. 5. And the second was named Asbeêl: he imparted to the holy sons of God evil counsel, and led them astray so that they defiled their bodies with the daughters of men.

Which supports the notion that sons of God in Gen. 6:4 is referring to the sons of Seth. Where it appears here that these angels possessed these women (correlating with the visions of Anne Catherine Emmerich) and then proceeded to seduce the sons of God, which were holy men, in this context, not angels, to defile these women.

Another passage of note is the following, which supports the idea that what we see today is exactly what these angels brought to corrupt mankind in those "days of Noe":

12. And the fifth was named Kâsdejâ: this is he who showed the children of men all the wicked smitings of spirits and demons, and the smitings of the embryo in the womb, that it may pass away, and [the smitings of the soul] the bites of the serpent, 

I'm not sure that leading them astray through the daughters of mean means that they possessed them or just that they used them to corrupt the sons of God.

In the passage right after what you bolded "led astray [all the sons of God]", it says "and brought the down to the earth".  Were these sons of Seth living up above the earth somehow?

I forget where I read it, but there's a belief that Eden was on top of a mountain before the Flood and the sons of Seth lived on it near the Garden while those of Cain went to the lands below. Hence the likely embellishment of these memories into the "holy mountain" where the gods dwell, such as Olympus.