A couple of points to be made that is overlooked or rejected....
a. The reference in Jude is SEXUAL in scope (going after strange flesh)
b. The reference to being married or not in heaven has NO reference to anything sexual (this is assumed)
c. There is a heavenly form and an earthy physical form
d. The contradiction is between the SONS of GOD and the Daughters of ADAM (this assumes all women were lost)
e. Noah was UPRIGHT...the word can carry the idea of GENETICALLY PURE
f. The GIANTS were wiped out in the flood and then 5 races again appear during the time of David
G. Enoch speaks to this (the book is referenced and DIRECTLY QUOTED BY MEN INSPIRED in the BIBLE)who canonized the bible?
H. The giants of the bible were warriors not tall men needing canes to stand or walk
I. They are compared to being as tall as cedars and men are grasshoppers in their sight
J. The skeletal evidence (concealed and covered up) points to creatures from 1 to 4 stories tall
K. As it was in the days of Noah (reports of Giants are again starting to pour in)
Reports of a special operations group killing a 15 foot tall red haired giant in Kandahar with 6 fingers and 6 toes and two rows of teeth that moved extremely swift and engaged the unit....took hundred of 5.56 and 7.65 rounds and a few .50 rounds to bring it down....watched the interviews with three different witnesses including the pilot of a C-130 that flew the remains to a base in Germany......have a personal friend that was in the command and control center (A MARINE 30 plus years service) that would not confirm nor deny the report....
https://www.youtube.com/watch?v=VzfyB15tl3I&t=11