According to Lisa Dabello who wrote the song, Black on Black is about the concept that everything that isn't controlled absolutely has a counteraction. Absolute power corrupts absolutely, but everything else has something that counteracts it. Pleasure/pain, the sacred/the profane, ice/fire all counteract but black on black is absolute. Her version of the song uses religious imagery and Heart's version uses military imagery, but both are based on the same overall concept.
So while the song uses imagery, it's not about religion or the military per se.
According to Lisa Dabello who wrote the song, Black on Black is about the concept that everything that isn't controlled absolutely has a counteraction. Absolute power corrupts absolutely, but everything else has something that counteracts it. Pleasure/pain, the sacred/the profane, ice/fire all counteract but black on black is absolute. Her version of the song uses religious imagery and Heart's version uses military imagery, but both are based on the same overall concept.
So while the song uses imagery, it's not about religion or the military per se.