The Bible speaks of giants as the offspring of a plot by angels to inbreed with mankind.  This first implies that angels had a direct ongoing relationship with humans as is referred to in Genesis 6:3 when Yhovah says he will end this close association. In Genesis the flood is pronounced immediately after the giants are mentioned, though not directly referred to as direct result of the phenomenon of the giants.  The verses following this brief mention of giants would seem to indicate that the giants and the flood were seemingly unrelated, and are dealt with as such by the pulpit. 

            The early Catholic Church found it necessary to eliminate the book written by Enoch, which goes into great detail about this plot by certain angels and it’s direct relation to the flood.  What Enoch relates is a story of deceit, mutant beings out of control, cannibalism, and a decision by Yhovah to end carnage perpetrated by these mutants, which was leading to the decimation of life on Earth.   It also shows that though the physical bodies of these mutants were destroyed, their eternal spirits remained intact and are directly connected to the demons encountered by Jesus. 

            For further information on this please see the section on the Flood to be found HERE.

            After the flood the Bible speaks of remnants of this mutant race appearing in the early books of the Old Testament.  They are described as very tall, up to 16 feet, having more fingers and toes than humans and associated with war.  One is even described as a king and entire regional areas are recognized as their habitat.  The word Nephilim is the plural Hebrew pronunciation of the word from which giants and giant were taken, and does not appear in the Bible.  The word Nephil comes from nphiyl, pronounced nef-eel' , a bully or tyrant.

            There is much evidence in history that clearly show giants have been with us far beyond ancient times.  Here are the verses in the Bible that describe giants:

Genesis

6:1 And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them,  2 That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose. 3 And the LORD said, My spirit shall not always strive with man, for that he also is flesh: yet his days shall be an hundred and twenty years. 4 There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown.

Numbers

13:13 And there we saw the giants, the sons of Anak, which come of the giants: and we were in our own sight as grasshoppers, and so we were in their sight.

Deuteronomy

2:10 The Emims dwelt therein in times past, a people great, and many, and tall, as the Anakims;  11 Which also were accounted giants, as the Anakims; but the Moabites called them Emims.

2:20  (That also was accounted a land of giants: giants dwelt therein in old time; and the Ammonites call them Zamzummims;  21 A people great, and many, and tall, as the Anakims; but the LORD destroyed them before them; and they succeeded them, and dwelt in their stead:

31:11 For only Og king of Bashan remained of the remnant of giants; behold his bedstead was a bedstead of iron; is it not in Rabbath of the children of Ammon? nine cubits was the length thereof, and four cubits the breadth of it, after the cubit of a man. 12 And this land, which we possessed at that time, from Aroer, which is by the river Arnon, and half mount Gilead, and the cities thereof, gave I unto the Reubenites and to the Gadites. 13 And the rest of Gilead, and all Bashan, being the kingdom of Og, gave I unto the half tribe of Manasseh; all the region of Argob, with all Bashan, which was called the land of giants.

Joshua

12:4 And the coast of Og king of Bashan, which was of the remnant of the giants, that dwelt at Ashtaroth and at Edrei,

13:12 All the kingdom of Og in Bashan, which reigned in Ashtaroth and in Edrei, who remained of the remnant of the giants: for these did Moses smite, and cast them out.

15:8 And the border went up by the valley of the son of Hinnom unto the south side of the Jebusite; the same is Jerusalem: and the border went up to the top of the mountain that lieth before the valley of Hinnom westward, which is at the end of the valley of the giants northward:

17:15 And Joshua answered them, If thou be a great people, then get thee up to the wood country, and cut down for thyself there in the land of the Perizzites and of the giants, if mount Ephraim be too narrow for thee.