Thanks for your comment.
We have had the artificial discussion so I won’t go over that again but yes you are right that that you can’t separate the long chain of events and say civilization starts at some particular point. Previously you selected the big bang as the beginning of everything. That works for me but colloquially civilization is defined as a human society that has highly developed material and spiritual resources and a complex cultural, political, and legal organization, an advanced state in social development. If there is a scientific term for civilization I don’t know what it is.
Not everyone is going to agree with us that there is an unbroken chain of events that made civilization predetermined. I even have some doubts about strict determinism.
Picking a date when civilization starts is just a convenient arbitrary red line that can be used as a reference. That date will vary of course from place to place and how people define civilization or as new archeological information become available.