You don`t think there was a 10 thousand BC? Why is that? LOL<quoted text>
Your first error is to presume there was a 10000 BCE there was no. You second error is to try to calculate the population grown on modern figures as you have been doing very inaccurate and non-representative of historical figures.
300 years is not sufficient time for 8 people to propagate enough `other` people over the ENTIRE GLOBE to enable the functioning civilisations which existed at the time...to exist.
Ergo:- your global flood didn`t happen, and like the rest of your 16th century book of social control, it just doesn`t make any sense.