>Could there be an unjust god?
From my premise #1 (God is) and #4 (God is just), there could not be an unjust God.
>So if the just god renders a just punishment then he could then say that "a person who does not believe in me but has led a good life is saved" and "a person who did believe in me but has not led as good a life as that other person must be punished." A just god might say that correct?
<
I agree that "Any person who leads a good life will be saved". Now, the question is: who defines "good"? I propose that God defines it. From your second statement ("...has not led as good a life as that other person") you seem to define "good" as a relative comparison between humans. If that is also God's definition, then we are in agreement. I propose that this is not God's definition of "good".