Re: Jainism sounds like a great idea, I love it but is it too impractical?
True, we do this, but if you look at the history of religion such as the one outlined by Robert Wright, it seems clear that religion developed as an attempt to restrain individual impulses to do what we want, take what we can get. Then from the very first, some people found a way to manipulate the religion to be more favorable to themselves. But overall, just looking at it from a social control standpoint, we'd have to give religion I suppose some kind of credit for maintaining order. Gradually, this function passed over to secular law. What some people don't like about that situation is that it is so secular, and they want to at least pay lip service to a god in charge. So you have those legislators in Kentucky saying that we should depend on God to protect us from terrorists.
Any time you have folks with "special powers" to access the divine, there's trouble ahead and charlatans in the making. So if any religion is to prevail, it has to be one that's based just on common sense and common morality, such as the golden rule, and it's questionable whether that should be called a religion at all.
I'd be okay with faith simply changing so that the ugly parts were removed, the parts that merely reflect the prejudices of a culture, as you say. Some people who call themselves religious have done a pretty good job of this, so I suppose it could happen on a larger scale.