I imagine it would be wonderful to have a holy book of my own, only filled with the things I already believed and agreed with. It would make it terrifically easy to believe in whatever God was being advocated. Imagine, a God that thinks just like me! I wouldn't be expected to change or improve myself at all anymore -- just wave the book around and tell people to be exactly the way I think they ought to be.
Sarcasm mode off. I think the question is entirely hypothetical, really. If I ever found a religion which said I was perfect the way I am and had no room for improvement, I'd consider it highly suspect. Show me someone who's entirely pleased with the way they are now, and I'll show you the biggest bigot this planet has ever known.