I have faith in God,and I will question you on the op.
First of all it is my beleif that some riligious people and some atheist argue over the same thing ,'the Bible".
Although there are some good basic rules to follow like thou shalt not kill ect.
Everybody keeps forgeting the Bible was written by man,and sometoimes man makes mistakes.

The fact that an atheist is asking why not judge God is a bit strange to me seeing atheist do not beleive the existance of God.
It is ad always been my beleif that God should not be held accountable for mankinds mistakes.

As for the answer to your question "why not judge God?" "why not judge the "big bang theory".
I can not prove God exist but I have faith that he does.
Can any sceiintist prove that the big bang happened?
No they can come up with theorys and supitions and ideas,but pproof no.
The sceintist and atheist say well this person said this that person said that.
Bottom line the Bible we can say this person said this that person said that.
So basically, beleive what you want have faith in what suits your lifestyle.

The one thing that I would ask the op post.
If you could judge God what then?
Who's going to be the prosecuting attorney,who will defend and who will decide?
Throughout time all kinds of humans have ask why does God does this,or why God does that .
The answer is quite simple.
I DON'T KNOW.