Bible God says that the Giants were here before and after the flood

I noticed that in the Bible God says that the Giants were here before and after the flood, let's go ahead and read it in this 168 year-old Bible so here we are in Genesis six and it says, and it came to pass when men began to multiply on the face of the Earth and daughters were born onto them, but the sons of God saw the daughters of men that they were fair, and they took them wise of all which they chose, and the Lord said my spirit shall not always drive with me for that. He also is flash yet his day is show. Be 120 years there were giants in the Earth in those days, and also after that when the sons of God came in onto the daughters of men and they bare children to them, the same became mighty men which were of old men of noun, and God saw that the wickedness of man was great in the Earth, and that every imagination of the thoughts of his heart was only evil continually oK, so going back do you see that it says we're Giants and earth in those days and also after that feel like this is a clue that the Giants did stick around after the flood some of them survived and when we look back at some of the history and people saying that they have found Giants and caves the stories of the petrified Giants that look like mountains it's amazing to me. If you don't believe in Giants, tell me why not.