Methinks you're wanting to discredit Christianity based on the way supposed followers act... seems like bashing.
You may not understand Christian theology about sin and redemption, but here it is in a nutshell: man is basically evil, and prone to evil doing. Sin, as it is called, separates man from God. Jesus died, as the Son of God, as the final atoning sacrifice needed to bridge the gap to God. The nature of man, however, remains sinful. Through grace can a sinful man be forgiven.
This theology is often seen as a major cop-out, because, supposedly, one could do anything, ask for forgiveness and that's that, which is probably what annoys you.
The thing is that, after a certain confession of faith, the way a person acts is meant to change accordingly. If you observe no change, you may start to question the veracity of the belief the person has, and rightfully so.
"What good is it, my brothers, if a man claims to have faith but has no deeds? Can such faith save him? Suppose a brother or sister is without clothes and daily food. If one of you says to him, "Go, I wish you well; keep warm and well fed," but does nothing about his physical needs, what good is it? In the same way, faith by itself, if it is not accompanied by action, is dead.
But someone will say, "You have faith; I have deeds." Show me your faith without deeds, and I will show you my faith by what I do. " James 2:14-18
The reality of the situation is that, you may pass judgment on a person according to their actions, and call out their hypocrisy if they made a confession of faith, but that does not in any way invalidate the teaching. All Christians will err. It is logically fallacious to throw out Christian theology because of any such erring, because the whole foundation of the doctrine is that man's nature is such.
