I am not 100% on whether the sons of God were fallen angels or not but I am sure they existed before mankind. According to to Genesis chapter 38 they were shouting, singing and giving God glory during the process of God causing dry land to appear. If you read verses 4 then 11 then 7 it is easier to ascertain what is going on without getting lost in the weeds. God is asking 'where were you when i caused the foundations of the earth, when I said to the waves no further shall you come while the sons of God were shouting for joy'. This all took place on Genesis day 3 when God caused dry land to appear and called it 'earth'...i.e. the foundations of the earth or the foundations of dry land. Man was not created until day six...so these sons of God were not men. Furthermore the garden of Eden was not wiped out by the flood but moved to the center of the earth by God, after it was cursed, to keep the tree of life away from fallen mankind. You can find that in luke...where Jesus refers to the garden as 'Abrahams bosom', again in Ezekiel 31:16 where God speaks of casting the pharaoh of Egypt into hell or hades so hard that his impact shook the neighboring land, trees, and twelve nations of Israel that were being comforted in the 'lower parts' of the earth in Eden. just for general info, the last name given to the garden of Eden or the garden of God can be found in revelations 2:7 where Jesus refers to it as the Paradise of God. You can be sure Paradise is the garden because the tree of life is only in the midst or middle of one place...the garden of Eden. if you have any other questions let me know...shawnnweed@yahoo.