Actually it does not say either way that Cain and his parents were the only ones of the Adamic race around at the time,so this could be taken in several different ways.It is possible that Cain and Abel as well as other siblings not mentioned could have already populated a portion of the earth and that Cain was only mentioned because he was the first murderer of the human race and Abel was the first victim as well as first death of the human race.As for the sixth day creation,it is possible that the later creation event as you would like to seperate could be a retelling in more detail of that sixth day creation.You see simple answers can be formed without having to change the text.You see talls theories are fine and dandy but they do not coincide with the word on many levels.You try to limit Adam to being the first Adamic man,but not the first man even though God declared Him the first man and eve the first woman.Now we come to the line of Cain,it is possible that the mark of Cain was to be a Giant and that because of his murderous ways he was no longer considered a son of God.Now we know that very often a tall woman is still only the size of an average man,now I know this isnt always so but humor me.So take this into account when we look at sons of God,meaning anyone who hadnt rebelled,and daughters of man,meaning those who had rebeled,a few centuries go by and everyone has rebelled except for Noah and his family.Now this does not mean that those who have the genetic trait for giganticism where not part of Noahs family,but that they had merely accepted the truth and were considered of God.Eight people are the only survivors of the flood,the Bible clearly states this in one of the few verses I have offered.Amongst this eight people,all have the potential to rebel but this takes at least a generation to occur.Now look at Hams sin and the curse of His son Canaan,rather than this being a curse,it could easily be a prophecy taken as a curse.Canaan comes along and is rebellious as predicted and it all starts over again just as with Cain.Now we know down through history the Kenites,in the form of several different but similar nations,Canaanites,Midianites and a few more I cannot recall at this time,but all can be traced back,if not genetically but religiously,to the Kenites.Even the Chosen race,which I prefer the Chosen faith,rebelled quite often and had to be chastised by the Lord.This is evedent throughout scripture.You see anyone who rebels and purposely tries to stop the Lords work can be called the sons of satan,kenites,canaanites,pagans,These are titles given to rebels against the Lord.Look at this,homosexuals,musrderers,fornicators,liars and the list goes on of titles given to rebels against the Lord,but many of us where just these things and we still have the temptations,but we are sons/daughters of God who just so happen to faulter at times,but we are no longer titles as these things because we are Christians first,sons/daughters of the most high who are tempted and stumble from time to time.I do not hate anyone here and yes I realize that this theory of the serpant seed and the kenites does not affect ones salvation,but the hatred that can be justified by it can affect someones salvation,it can give someone a false sence of salvation while they are our their murdering and raping those they deem inferior,and all they have to do is declare them sons of satan or kenites and they feel justified to abuse these people.How many people may be turned from salvation because of someone justifying their actions as being of God because they are against what they consider an inferior race or belief system.Look at the Muslims,if you arent one of them you are against them and they are justified to kill you.Look at the Jews,withing their Talmudic teachings,they are justified to use and abuse whoever is not of theis faith,and the list goes on and one of those who justify and abuse their own faith,even the Christians because of one little divergent doctrine or theory."Love the Lord thy God with all your heart soul and mind and Love your neighbor as yourself",these are the two greatest comandments with promise.To give a theory or doctrine such as the Kenites or the serpant seed undermines the two greatest commandments and leads to the distruction of the teachings of Christ.As I have said,and it was erased,I apologize for any seeming attack against anyone here and for my seeming sarcasm.My main concern is for those who are unlearned and those who seek justification for their hatred.How many of them are we damning to hell by teaching a doctrine of hatred towards someone else whether deliberate or just by being slightly miguided?