Drawing a line in the sand...where, exactly?

Have you heard about this story?:
http://abcnews.go.com/Business/teacher-fired-pregnant-wedlock/story?id=10878802&page=1

A teacher at a Christian school was fired because she admitted to conceiving her child 3 weeks before she got married. This brings up what I think are some very interesting questions regarding Christian conduct.

What should be a Christian's (or a Christian organization's) response to sin?

We have examples in the bible of the woman caught in adultery who was brought before Jesus. We also have the example of the man in a sexual relationship with his stepmother who was put out of fellowship.

Who gets to decide when a Christian must be punished for their sin?

Who gets to decide what sins are punishable? How can we know what someones sins are? Are we even aware of all of our own sins? Wasn't there a sacrifice made in the Old Testament for sins the people had committed in ignorance?

When is it right for us to forgive someone for their sin, and when is it right for us to punish someone, so they will hopefully be led to repentance?

I will concede that the fired teacher did commit sin. What about all the other teachers at this school? Is the assumption that they are living without sin?

Is there a distinction between sins? Are there "acceptable" and "unacceptable" sins?

One argument I frequently hear from Christians is about someone having a "lifestyle" of sin. They say a Christian does sin, but that it is not their typical "lifestyle" as it would be for a non-believer. OK, so is God willing to overlook sin, as long as it is occasional?

I'm not trying to make a case here for license to sin. I understand the school's attitude that it wants to project a certain image. I know the verses about "a little leaven leavening the whole lump." But if we are truly honest, I think it would be very difficult to find non-sinning teachers to work at a Christian school.

To me, this is the ugly truth that we, as Christians, do not like to face. None of us, not even one, no matter how many years we've been Christians, no matter how much time we spend in prayer, no matter how many good deeds we try to do, is without sin. I'm not talking about sin in your past, before you were born again. You and I are sinners today. We are all alike, because we are all guilty before a Holy God. As much as our hearts want to do good, we cannot escape our sinfulness. There is simply no hope for humanity without a Savior. Have you thanked God today for the gift of his Son? He is the only reason we can have hope and joy. It is not in us, friends, that we can have these things. It is only in Christ.