eggman
I have Yolks not Brains!
True. I agree that every event has to have a parent event which happened some time before the current event. And it seems obvious , because we experience time as a continuous event that seems to have no start or end.
You're assuming that the initial event (root of all events, maybe big bang) happened at a moment when time existed before that moment.
But what science tells you (although with not 100% confidence) is that TIME itself did not exist before that event. There was nothing but singularity before that. There was no TIME before that moment. i.e. if you have a time machine and keep moving the dial backwards and backwards , the dial would get stuck at that moment. Since there is no TIME before that , it can not go further in reverse.
I know, it still doesn't answer your question, that what was the trigger of that event. Why did it happen? What was it's reason and what was it's purpose (if it really had one).
Unfortunately , at this moment science can't tell you with certainty. Yes, it has theories and speculations but nothing is 100% sure.
But, it doesn't mean that we will never be able to find out. Every day science is getting closer to it and (my expectations from it's track record) is that one day it will find out the reason. It might happen, that it may raise 5 more questions while answering that .
I would recommend you to watch an excellent lecture :
YouTube - 'A Universe From Nothing' by Lawrence Krauss, AAI 2009‏ .
The sad fact is , we don't know everything at this moment and ofcourse it'll be great if we had the answers to everything. But for the unanswered questions , if you say "God did it" , it's not right , although it will quench your thirst . The reason is:
1)There is no way to test it . And there will never be. The thought is comforting , but it is not the truth.
2) If you assume God did it, then you will never have the desire to find out more and thus blocking your means to look for answers.
Sorry but wrong. Absolutely wrong. It tends to zero, but is not zero.
Consider a line . It is obvious that it exists. But it made up of smaller particles.
On a computer screen it might have been made of 10 pixels. But of course the pixel can be divided further and further and further. But do you say that at the end of it , that line is made of some basic atom unit , which is of length 0? Obviously it can't be true , because if you put any number of that unit (of length 0) that answer would still be zero , since anything x 0 = 0 (except infinity ) . The truth is you can never reach one basic atom unit. It might suck , because you would want to get to it. But you can't . However you can operate mathematically on those unit , using calculus ( concept of Delta). But unfortunately, you can't isolate it .
Time , the 4th dimension , is just like that linear line except that we can't control our movement in that dimension like the other 3.
The Delta(time) , the smallest change of time , will always have a value but can't be realized as a measurable unit.
Hope it helps. The basic questions of life are the most mind boggling.
But saying "God did it or made it this way " just gives you a reason to give up your responsibility to find out more . 
...it is again you assumption ) . 
