I think I've mentioned this before, but my primary experience is from college, living with an evangelical Christian and dealing with the Intervarsity Christian Fellowship.
I thought that backsliding, continuing to sin, re-dedicating their life was part and parcel for Christianity, since no one is perfect, and the devil is always tempting them. I also thought confession was another way of coping with that.
Also, most of the fundamentalist churches basically think that only a select few of the people who think of themselves as "Christian" are really "saved". That's the viewpoint of IVCF, although IVCF only has one criteria, "accepting Jesus" to be saved. That's fairly liberal for Christianity. Of course, they think that the unwashed masses haven't done this, that's why they're drinking and having sex and listening to rock and roll music.
I could go on, but it's probably not appropriate for this thread.
Ummm... Isn't David Murray-O'Hare (son of the famous atheist) a born-again Christian? Might be interesting to look up in relation to this topic. I don't personally know of anyone who was a confirmed atheist becoming born-again. Well, none that have revealed it to me.