A true believer is not seen just on the outside. Christianity is a lifstyle. It defines your character, your interaction with others etc. It is on the outside and inside. I don't ever try to figure out who is a Christian by looking at them.
i agree with sleandra. you will find bikers loaded with tattoos that are Christians and you will find women who will neve wear pants that are Christian. looks are an impossible way of telling if someone is a true believer. the inside is what counts.