I think we might be getting hung up on our own beliefs and attempting to place labels on various forms of music. One music lover once told me radio and record companies feel the need to put a label on all music but he found only three types: bad, medocre and good.
I have worked secular radio and Christian radio. I think I might be able to offer some perspective.
Your format is 'uplifting and positive' versus spiritual. Uplifting and positive has nothing to do with religion while it has everything to do with religion. If we break down the teachings of the world's major religions we find many commonalities. Be kind to one another. Do not steal, etc. Musically, I like Gregorian Chant when I'm in a certain mood but I don't understand the words. There are certain classical pieces that transform me mentally yet they, in the most literal sense have nothing to do with religion. Other forms of music do the same...sometimes the lyrics, sometimes just the instrumentation itself.
Perhaps your focus is on positive music that enforces the teachings common to all major regilions without ever mentioning religion. If a station simply encouraged self improvement, moral values and leaving a positive legacy, perhaps many could find room for such a station. Such a format could, in lieu of featuring any teaching, feature people who have made a positive impact, shown courage or simply demonstrated the sort of values every major religion teaches.
One thing I would suggest is NO NEWS. News is primarily negative in content.
I would avoid religious labels in such a format. I have known lots of people. I've found some athiests I have known are very moral and honest. I've known many of non-Christian faiths who were the same way, so perhaps one should leave the can of worms away from the can opener. If the format is approached from a level of respect of religious beliefs, it could work. Possibly family friendly can be a focus. It could include all facets of daily life. Imagine comedy bits that your child could hear that were actually funny.
If any religious thought was to be included it would likely create 'battle lines' among listeners even if approached from an educational standpoint. For example, if you were to talk about marriage customs in Bible days, you'd learn Mary was to live with her family for a year before Joseph took her to his home. If she became pregnant during that year, he could go to the town council and his marriage contact voided. The council could, upon determining Mary was 'with child', order her to be stoned to death. This could easily explain why Mary went to stay with Elizabeth. Mary's family may have feared their daughter could be killed. This tidbit is historically and culturally correct but some want to think God would never work out His plan by using the typical functioning of society.
Radio needs a push toward new ground. We need to learn to think outside the box. You may really be on to something here. Remember, many claiming to follow a certain belief system subscribe to the basics and their depth of knowledge is pretty shallow. These same people tend to be very respectful and relaxed with other belief systems. They'd meet a Muslim and ask a million questions seeking common ground and walk away smiling because they share some values.