Your question can be reduced to: Is there a god?
In western philosophy "God" and his/her/it's creation are separated entities. (Causeless) existence is one of "Gods" properties (as it is a necessary property of perfection, which is by definition THE property of what we call "God"). For many western philosophers this simple teleological argument is enough to proove "God".
If you reduce "God" and the world to one entity (as many religions do) things are getting a bit more complicated and your question can be rephrased as: "Existence. - Why and what for?"
I'm sorry to say the following: There is no satisfying reason for existence per se.
No enough evidence for God's existence?
Not enough to prove him/her/it as an "unmoved mover". :) - That said: I don't want to hinder anyone in his or her believe.
Go ahead, hinder please it's part of it.
Nay. Arguing is bless, hindrance is sin. ;)