Why would anyone live like Carrie's mother?
I know she may be an extreme example of this kind of religion, but I guess many people live like this, god-fearing, seeing sin in absolutely everything natural in life and turning to the Bible for every little thing, and with prayer being almost the sole activity in the household. I can only guess that they want to go to heaven and avoid hell at any cost, but it's really not a way to live, is it? I mean, living your life thinking you'll be damned for eternity for the slightest mistake, only to find nothing happens after death. No-one knows what happens after death, and I personally don't think it will involve what I described above for Christianity, seeing as there are hundreds of other religions on the planet with beliefs about the afterlife.
I'm just saying, enjoy your life without any worry about after death, and live and make the most of every day as if it were your last.