An excellent question.
Yes, that is correct, simply by the date of birth, nowadays the computers will tell us a lot about ourselves and especially of the past. The date of birth is associated with planetary movements and specific energy it emanates. For centuries, data has been gathered and correlated with specific events and periods. Thus a specific movement of the planetary position, has a specific energy and frequency in general, and relates to a specific time and date of birth. So the belief of fortune tellers, astrologers, card readers, psychics is that the planetary positions determines what you are and your destiny.
Let me explain.
Most people if not all are reincarnated in order to complete their understanding from previous lifetimes and to unite with their radiant soul in order to be eternally in Bliss and live eternally.
Their soul chooses the best and the most advantages time and location including the parents for their accelerated evolution. This energy and frequency coincides with that of the universal energy. Thus the similarities and the explanation.
If we chose to believe a fortune teller (psychic), we would have given away our power away to them and accept what they say. And once we accept what they said of the future, we focus on that specific outcome and thus it happens. We then say that they were right.
If we do not believe in them, then we do not give our power away, and not even bother with them.
It has to be clearly understood that each one of us is divine and we make our own destiny. We do not need priests, rabies, imams, gurus or anyone else in order to contact the source of all information. Thus what all religions call God, is actually within each of us and we do not need them as intermediaries.
Attitude is everything.