One of the most fascinating stories in the Bible is about the Nephilim first talked about in Genesis chapter 6.

Genesis 6:4 The Nephilim were on the earth in those days—and also afterward—when the sons of God went to the daughters of humans and had children by them. They were the heroes of old, men of renown.

I've also read about these beings in the Book of Enoch, which is a book that is categorized as being pseudepigraphal in that they are falsely attributed to a biblical character (in this case to Enoch).

There have been some debate on if the Nephilim are a human/angel hybrid or if they were just human.

What is the biblical evidence for and against each view - that they are hybrid beings vs. they are human?