This is one of the tougher questions which people in the world, and probably on here are going to be ones which could debate for hours on end about it. I personally beleive in Evolution, starting with the big bang and propelling the world to what it is today. But the tough thing in all of this is that I still think there is some divine force which made this all happen, I think there is a higher power (God) which sprung all of this into occuring the way that it did.
There's no way to explain this, and that's the reason that I look to god on this.
How did every thing in this world started?
I believe in Creation and I believe that a higher being caused us to exist That in 7 days He was able to create the Universe, the planets and ultimately us. We exist because we have a purpose and the meaning of life is to find that purpose and whatever we would plan to do is all in his plan.
Science disagrees.