* If god is just, then it doesn't matter what I believe so long as I'm a good person.
This one's a bad argument?
Yes.
From the perspective of an athiest:
That logic being used could be applied to anything, not just religious belief. For example, believing that oranges secretly rule the world from inside Elvis' left nostril. Sure...maybe believing that oranges secretly rule the world from inside Elvis isn't going to hurt you, or cause you spend eternity in a fictitious hell, or anything like that...but saying that it's ok to believe "whatever" is basically silly. Imagine a scientist conducting an experiment and then ignoring the results and thinking it's ok because he's a nice guy. That's not a reasonable way of doing things. You can't ignore fact based on morality.
From the perspective of a thiest:
You're assuming that "being good" is fundamentally a measure of reality. And ironically, that
only makes sense if one has a religious outlook. For example, if there is no afterlife, and we simply cease to exist when we die, then what does it matter whether we are good or bad? Billions of years from now when the human race is gone and our planet has been consumed by the expansion of our sun, there will be nobody left to remember or care or be affected at all whether we were good or bad.
Why would you believe that "being good" has value unless there were some sort of measure for it? If there is no God, if there is no afterlife, then the most logical measure of value would probably be
survival. And being "good" is not necessarily an effective survival strategy. Now...you could hypthetically argue that extreme selfishness can be counterproductive in the long run, from the perspective of a species instead of an indiviudal. If we're all backstabbing opportunists, then our species might die. It's
practical to be "good to each other" in so far as it promotes over
overall survival, since the individual can't survive if the species dies. But...even if you make that argument, it's
not an argument in favor of good. It's still the same: survival is the measure of value, not "being good." Either way, being a "good person" is not important, survival is. Placing value on "being good" is fundamentally a
religious argument, whether or not one brings God into the equation.