If you think about it didnt eveery event in life really happen all at one time?
To put this theory in an example would be even though in "time" things happened in a certain order...big bang, planets formed, monkeys humans, your parents being born you bening born, i believe it all happened at one time

This theory is really hard to grasp but once you get it, it makes complete sense.
Its like everyone was born at the exact same moment, even though other people have been alive longer than you and others are being born right now.

I will try to go into more depth if this is not undertood. Makes complete sense when you understand it...its just hard to put into words