if astrology is true, then, whom you should marry is also pre-destined.
no astrologer can change it.
no priest can change it.
if everything is pre-destined, then what is the role of astrology?
an astrologer's guidance can only help you see matters in a astro-perspective, which is remarkably efficient.
astrology gives you reasons, without which you will be puzzled why such and such things have happened in your life.
it makes you more grounded. and, it helps to liberate too.