I don't really see much "personal choice" going on with people who put their faith in the bible. Although many claim they read the bible and make up their own mind about what it means, the reality is someone else reads it and tells them what it means and if it sounds good to them they agree with it. For example, we have a self-described biblical expert in this group who tells us what the bible really means when obvious nonsense is pointed out, and as proof he finds someone, somewhere on the interwebs who agrees with him as if anyone is going to believe he came up with it on his own and others did the same and came to the same answer. All this really means is religion is inherently corruptible. If you are allowing others to tell you what god wants, then you are under their control.
I suspect you would still derive your one "truth" without the bible or any religion. If someone really needs a book ghost written by the holy poltergeist to treat other people well, then one has to wonder if they are genuinely good at all to begin with.