I share your sensibility that God comes first. Then family. As it works out, my time belongs to my family. But my first priority, my first commitment is to God and religion. The commitment to God transcends all circumstances -- even the circumstance of family.

My submissive wife and I have young children, so I don't know that we live a 'lifestyle.' We have sexual personae that ignite each other. But it is just one role we play. I don't feel if we express sexual dominance and submission, we are compromising the other roles we play. So you have your religious commitment which you would like to transcend all the roles you play. Certainly that is the Truth, though I myself don't need to stand on principle over it. For me, I wouldn't feel you are betraying your commitment to God by addressing your Master as such.

I guess if you were to try to really integrate the sexual submission with religious submission it could be done. Certainly there are religious traditions in which submission to a husband is considered a wife's spiritual duty. Or a nun or monk might be obediant to a superior. In The Story of O, there's a brief passage in which O identifies her submission to Stephen as like submission to a God. In Buddhism and Hinduism, some Gods have consorts. You might approach your sexual relationship in that way as being of service to the divine Masculine.

In any event, thank you for sharing your faith and blessings to you.