Every law boosts one stat but lowers another - in this case "Female Soldiers" boosts some stat (security or freedom i think) and lowers Faith. You can overcome the penalty by getting other ways of boosting Faith (such as setting religion expenses to maximum, activating a religion class and building a church).
Some laws have other effects. Allowing slavery makes slave trader to appear in the brothel, allowing monster pets spawns a pet Water Fairy in one of the houses and changes dialogue of kids in that house, etc.
I don't know all of the effects though.
Some laws have other effects. Allowing slavery makes slave trader to appear in the brothel, allowing monster pets spawns a pet Water Fairy in one of the houses and changes dialogue of kids in that house, etc.
I don't know all of the effects though.