I will prove to you that God exists

[Sheldon]

The answer of whether the universe and life was intentionally caused or was unintentionally caused by mindless natural forces is up for debate 

That's a false dichotomy, it remains irrational no matter how often you repeat it. there is also no objective evidence the universe we currently observe was intentionally caused. So that alone is sufficient reason for me to disbelieve your claim, I need entertain no other cause to do this. 

at this point all anyone has is there opinion. 

All you have is subjective and unevidenced opinion, thus I cannot invest belief. I have no opinion about how the universe came to exist. 

I could be wrong...you could be wrong.

False equivalence fallacy, you're making a claim, atheism is not. Again simply repeating this fallacy doesn't make it any less irrational. 

Stop pretending its cut and dry and one opinion is obvious and the other preposterous.

Straw man fallacy...and around and around you go...

Is there some reason you'd rather it was unintentionally caused? 

This has been answered, you're simply projecting. 

Do you have a stake in that belief?

Atheism is not a belief.