Is nihilism the logical extreme of atheism?

[Jenny A]

The major difference between the atheist structure and the Christian structure is that atheists are compelled to form their structure from reason and Christian use The Bible and/or revelation in addition to (we hope) reason.

What I don't see is how having a moral system created by god would provide humans with more purpose in life.

I think our position (Christians and other theists) is reasoned where atheisms is sensed. The bible, for example, is evidence of the reasoning process. Atheists can reason and do, although their reasoning is limited to a non perfect reality as it's base. Intrinsically inferior. So of course, a moral system encompassing justice trumps a moral system based upon injustice.

Interesting. If I understand you correctly, what you are saying is that:

1) Reality or our perception of it is flawed (which? both?);
2) Therefore any reasoning based upon that imperfect reality is flawed;
3) Atheists only have access to reality, therefore any moral reasoning by atheists is flawed

and

1) god is perfectly just
2) reasoning to determine what god's justice is, is not necessarily flawed because it god's justice exists.

So I'm supposing for a minute that this just god exists and therefore so does a kind of platonic ideal justice. The problem is that even if that is the case, humans clearly have an extraordinarily flawed understanding of what god or his justice really is. So:

1) Any reasoning based upon a flawed perception is inherently flawed;
2) God is the definition of justice;
3) And Christians have a limited and flawed perception of god and his justice;
4) Christians reason based upon their flawed perception of god;
5) Christians have a flawed moral system.

Which would explain the numerous contradictory theist views, both between sects and over time, on the nature of god and justice.

I would go a step further because I see no evidence of this god entity.

1) The ancients understanding of reality was considerably more flawed than our own flawed understanding;
2) Theists have a tradition about reality including a god figure which evolved out of ancient man's attempts to explain those parts of reality he found inexplicable.
3) Theists now allow the ancients flawed tradition about reality to be a greater authority than actual perception or scientific advances when determining what reality is;
4) Thus though the perception of all men about reality is flawed, theists perception is more flawed than atheists;

Thus the morals of the religious extremists tend to be stuck somewhere between 500 BC and 300 AD.