There are many Metal bands that already have songs, albums, and names about the Gods. Obviously you will have a different understanding due to being a Zevist. I'm also a muscian and singer. I think you should broaden you idea. Think about it a bit more and see how you can differentiate yourself.
I wrote a song that is about the personification of Satan in the music industry. I also have a song about how the Gods are different aspects of the universe. Like color and time. Try to expand what it is that you want to say. Also remember that not every song has to be about them. Sometimes the best song dedicated to the Gods could just be a great song you wrote.
I wrote a song for the Gods for one of my rituals. It wasnt about them. It was actually about my girlfriend, but it came from the soul. I put my all into that song. I still think it's the best song I've written so far.