I recently heard an author on the radio bemoaning her conscience and principles, instilled in her brain by parents, teachers and ministers. Her quest, apparently, is to become unprincipled. While I understood her resentment over certain sexist aspects of her conditioning, I think she is perhaps throwing the (well raised) baby out with the bath water.
While I no longer subscribe to my native Christianity, I do appreciate the one central commandment of the mythic Christ: Love thy neighbor as thyself, or, do unto others as you would have them do unto you. That is the basic principle of all compassion and mindfulness. And, if followed, naturally leads to right thought and right action in its practitioner.
Perhaps this is the key to secular humanist morality and ethics. No harsh paternal figure required. No flames of hell as deterrent. No heavenly virgins as reward.
Being human in the most mindful and compassionate way in the moment when alone or with others as a practice is perhaps a higher standard of behavior than the standard of religions which offer ritual absolution for routine, mindless, hateful behaviors without a requirement of subsequent intellectual or behavioral changes.
My principles are my practice. If I proceed with intentional mindfulness and compassion through each day to the best of my ability, I feel it will be unnecessary to fret over the dictates of any religion, social trend or social pressure, which may be at odds with being a truthful, loving and open member of the human family.