I would prefer to avoid "Christian music". I mainly listen to secular music and Christian secular, particularly the latter because my favourite band, U2, is Christian secular. Firstly, allow me to speak on Satanic music, then I'll add my two cents into this discussion that's gotten going about Christian versus secular.
I would personally avoid Satanic music. Something that is actively promoting something so vile, so evil, so despicable as Satan should be avoided. There's a great difference between secular music and Satanic music. Personally, I listen to songs for two things;
1. The guitar. I LOVE good guitar. This might be why I'm becoming a Pink Floyd fan.
2. The lyrics. I rarely listen to music that doesn't have quality lyrics. Bono of U2 is such a fantastic lyricist - Bad, 11 O'clock Tick Tock, and Running To Stand Still are genius - and I find the lyrics make a song. It's very important. And the best lyricists write lyrics to get you to think, to convey a message, and they are performed in such a way to get your attention, to make you listen and to plant that message in your mind. I write a few songs myself, and if I were to start a band, I'd hope people would listen to my lyrics and think about the points I've made.
Now about Christian versus secular. Many Christian bands lack something that other bands like U2 have (I'm going to use U2 as an example because I know them well, but there's plenty of other good examples out there). When signed under a Christian label, there's certain things you can't write. You can't question, like U2 has done in 'I Still Haven't Found What I'm Looking For', 'Wake Up Dead Man', 'If God Will Send His Angels' or even 'The Wanderer'. You couldn't write something like 'Wire', 'Bad', or 'Running To Stand Still' because that implies you know someone who used/uses heroin. You couldn't roleplay like in 'Until The End Of The World' (Judas talking to Jesus) or 'The Fly' (described as about a man in Hell who's realised everything too late). The rules are very strange, and many Christian songs just sound like a remix of 'Jesus Loves Me' because the subject matter is so incredibly limited. The message is very simple and just doesn't seem real. There's no depth like in U2's music. Christian music only appeals to Christians and alienates everyone else, whereas Christian secular stuff like U2 appeals to both sides of the fence, paints a very real picture, and can even bring people to Christ (or save their faith, like with me).