The main reason I'm an atheist

[wiploc]

If a Christian says, "Just look at the universe and you can see that it was all made just for us.  What further proof of Jehovah's existence could you need?" then we get to point out that the universe does not look like it was made for us. 

Does a speck of mold in my refrigerator may believe that the refrigerator was made just for it?  If so, that proves more about the mold's mindset than it does about the refrigerator. 

When humans believe in gods because the universe looks like it was designed for us, those humans aren't being logical.  Rather, they are indulging in a fantasy characteristic of egotistical refrigerator mold. 

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In answer to your question:  No, this isn't a proof that god does not exist.  Rather, it is a rebuttal to one of the "proofs" that god does exist.

As a proof that gods don't exist, it would be lame.

As a rebuttal, it is a slam dunk.

But the OP stated a clear statement for which I did not receive any answer: How does the size of the universe tell us God does not exist?

I did give you an answer:  It does not prove that gods don't exist.  

All it does is refute a particular form of the design argument, and that it does very well.  

What is the relation between the universe being too big and God "not existing"? No matter how big the universe can be, God still does not dwell in it, since He is outside creation and He is transcendent in His ousia (essence).

As Dietrich would say in Barney Miller, it's a point of view.  

"When humans believe in gods because the universe looks like it was designed for us, those humans aren't being logical.", I would have to know how exactly those people believe the universe look like it is designed for us and after that declare them logical or not, I am not a follower of blank statements.

You're not likely to get a clear statement of the case.  It is a bad argument, so it works best (is most persuasive) when it is unclear.  Making it clear would make it clearly nonsense. 

Some theist arguments are so bad that they can't be stated at all.  The theists ask questions instead, so that we'll feel obliged to make up an argument for them. 

Example: "If humans evolved from apes, why are there still apes?"  
Proper response: "If you are descended from your grandparents, why do you still have cousins."  [/quote]