The whole point, Nick, is that secular decisions should not be made on religious grounds.
Medical procedures should not be "voted out" because, for example, Christian Scientists want to do faith healing instead. Eating fish on Friday should not be mandated because it is (or once was) a Catholic more. Obviously there are boundary layers between these things but the general guideline should be, IMHO, seeking the greatest good for the greatest number according to their enlightened self-interests, based on real factors and real consequences.
We should not, for example, start a war based on the notion that it is "holy" to do so.