Then why is it that the Westboro Baptists should not be counted as Christians? Where's the line between that and an immoral Christian?
I don't recall saying they should not be counted as Christians. It's impossible to answer whether someone is 1) not a Christian or 2) a Christian but a bad one. We can't read people's hearts and minds. There are some days I don't even know my own mind that well. As I said earlier, Christianity has a creed which you can profess, and then you're considered a Christian, but you don't even have to do that to call yourself a Christian these days.
The separate issue of how one behaves is complicated because Christianity attracts sinners. That's what it's there for. If you're a perfectly good atheist maybe you don't need Christ, but as I said before, when meeting requirements of a perfectly righteous and good God, the standard is very high. So when a sinner becomes a Christian, he may not automatically stop being a sinner. The "old man" dies hard. As far as Westboro, you're probably as good a judge as I am if you know anything of Christ's teachings and character. Whether you agree with America's recent wars or not, would Jesus want us to go to funerals and viciously torment grieving parents at the time of their deepest despair? No.
About the Klan, one of the things they are most known for is burning crosses. I always thought a Freudian psychologist should look into that. Professing Christianity while simultaneously destroying it's most prominent symbol - you tell me what kind of sense that makes.
So if Christians are not any more moral than atheists, why is it more probable that the Christian is more moral than the atheist?
Let's try it this way: Let's assume that Christians are no taller than atheists, and vice versa. Cabin A has an atheist in it, Cabin B has a Christian is it. Do you think it more probable that the Christian will be taller then the atheist?
That analogy is totally off base. My only response is to ask what philosophical grounds do Christians and atheists have for being the same physical size?
We have traffic laws because people are sinners?
Yes, I said why in the sentence that followed.
Were these laws handed down by God?
Specifically, no.
Do we need God to enforce them?
Perhaps in some sense. As I've said, God has left us conscience which makes us feel it's wrong to cut someone off in traffic. But as a practical matter, we additionally need cops and the fear of car accidents.
Why should I follow traffic laws?
You're assuming you should? I didn't say you should.
Wouldn't you say that societies are complex systems that needs order?
Need order for what purpose?
Do you think Christians are taller than atheists? Then why do you believe that the Christian in Cabin B will be taller than the atheist?
No.
It's a pretty poor analogy. Both hemispheres have societies which have managed to survive and live amongst themselves. That takes a societal contract, or morals and ethics. Flip a coin. Although, the western side has recognized chemicals, and that suggests scientific advancement.
Do you think all societies which have managed to survive and live are equally good? The Aztecs thrived for a long time. Nazi Germany was amazingly advanced and efficient. The Soviets were beating the Americans in the space race for a while. Nobody, good or bad, survives forever.
Yes, and I would prefer not to trust either person in either cabin, but that's not part of the scenario. Not trusting strangers is not allowed. You're asking me which I trust when I have to. You're claiming that the average atheist is morally inferior to the average Christian. Or, to use my analogy, you believe the average atheist is shorter than the average Christian.
See below response.
Why? Again, how does not knowing where someone's morals come from make them less moral?
I already said it doesn't. But there is legitimate concern regarding things unknown. My third attempt at analogy

: remember the TV show "Let's Make A Deal"? Behind door #1 is a man who believes that there may be eternal consequences to immoral behavior. Behind door #2 is a man who may or may not even believe in the concept of morality. And if he does have some morality, it is something which he has to acknowledge is made up in his head because it is seen to make society run smoother, or it makes him happy, or he just goes with the flow of the cultural influences around him, any one of which things could be discarded if it inconveniences him, with no real consequences so long as he's not caught. And if he's lucky enough to be a Head of State like Stalin or Mao, he doesn't have to worry about getting caught.
Or perhaps, religion has incorporated the social contract that earlier societies developed to create a sort of cosmic police officer to watch over people ensuring they adhere to the contract through fear: God. If God did not exist, it would be necessary to invent him.
The difference is that now we are coming to understand the nature of the social contract, and do not need God watching over us. We're getting closer to being capable of policing ourselves, and be moral out of social responsibility.
Social responsibily? Prithee, what is that?