Believers of the Silent Church are mostly female, and the doctrine does not forbid them from marrying and having children.
Love and being loved is a natural right for everyone, and given the feudal background of this world, women find it challenging to engage in a wide range of professions as they might on Blue Star. Thus, even the Bright Moon Goddess, who detests men to the extreme, would not deprive her followers of the right to form families.
Of course, this only applies to the ordinary faithful.
For the clergy within the Church, in order to dedicate their entire lives to the Goddess, marriage and childbirth are strictly prohibited, and falling in love with a man is absolutely forbidden.
Once confirmed, they would be sent to the Religious Tribunal.
This is why Louise previously harbored such hostility towards Xiya.
Perhaps it was Beatrice's overly twisted and abnormal views that led to the birth of this kind of mental chastity.