You can not prove or disprove the existence of God. That is why we have FAITH.
Please forgive me if I'm taking this more literally than you intended, but do you see the logic break there? The inability to prove or disprove cannot be the motivation to chose either belief nor non-belief. The "why" for having faith must have another source. To me, it suggests motivated reasoning.
The burden of proof lies in proofing something exists, not that it doesn't exist.
I don't have to prove that the Easter Bunny, Santa Claus, or Big Foot doesn't exist, someone has to prove they do. Just because I might have faith the Easter Bunny is real, doesn't make it so.
My mind is still reeling from your belief that the universe was created for humans to figure out.
So it existed without humans around for almost 14 billion years, just waiting around, twiddling its thumbs, for humans to show up in the last 100,000 years or so?
And then, when the earth gets engulfed by the Sun in another 5 billion years (I'm sure humans will long since be gone), the universe is just gonna take it easy for awhile?
You have no concept of size, or time, do you?