You're making the assumption based on nothing that that verse is referring to angels. It's far more sensible and scriptural to believe that is referring to Adam's sons who called upon the name of YHWH in faith, as it has always been throughout the millennia. The book of Job in the LXX does not call the angels who appear before the throne of God, sons of God, like the Masoretic Text does.
I proved your statement as false.
Why do you guys constantly refuse to believe the Word as written?
Read the first couple of pages of this thread to see the absolutely conclusive proof that angels mated with human women, producing Nephilim.