Can we say that any given event that has happened is the result of one initial act or event (the first act or event). Because we are not sure of the "first" act/event. There are some who believe that it was GOD, and there are others who believe that it was the big bang.

Is it possible that any one of the above events could have occured? It is very possible that it could have been something else.

I have choosen to believe that GOD was responsible for the act.

This does not discount any actionary/reactionary event that has taken place after that. Physics had to start somewhere too.