A lot of time I can guess the sun sign of a person by observing his or her behaviors. But I have met some people who are so different from many other people of their signs that my guess turns out to be wrong. I have also met some people who show so little typical personality traits of any sign that I am not able to make a guess at all. They often time are people with faith who have become very mature through their faith. I think when people are mature enough, especially through their faith, they do not show typical personality traits of their signs. I guess it is because they do not act according to what they feel like but according to what they believe as the right thing to do.
Not everyone who claims to have a faith or wants to have a faith can really mature through a faith though. That is why there are scandals and crimes among religious people as well. It is not an easy thing to accomplish to mature through a faith.