Yeah, I believe there were giants. The Bible tells us there were.
The Secret Doctrine, Helena Blavatsky said that in primeval times the earth had still not densified fully and was therefore larger than at present. All body forms would have been considerably lighter in weight and of a more plastic nature, the skeleton still not having hardened by then; and accordingly human beings could have been less affected by gravity and as much as sixty feet or more taller than they are today. She believed that over vast ages there have been several violent changes in earth’s climatic conditions, with corresponding diminutions of human stature, accompanied by many variations in human civilisation and culture.
Mainstream science has no real conception of how long modern homo sapiens has been in existence, or under what physical conditions, but certainly archaeologists are aware that homo sapiens skulls of an entirely modern type have been found that are over a hundred thousand years old. Swanscombe man from England is a quarter of a million years old, while Vertesszollos man from Hungary, equally modern in type, dates to an amazing four hundred thousand to seven hundred thousand years old.5 Such dates leave ample room in our human record for many modifications of climate and variations in the physical stature, cultural development and living conditions of human beings.
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. (Genesis 6:4)