Musically, it might not be all Christian. Let's compare a ministry: Southern Baptist Convention, producers of PowerLine, a once 30 minute weekly program of current top 40 hit music with Christian themed features in the program. If you ask folks, they'd say it was a Christian program.
What a great example. PowerLine was a show the FCC accepted as qualifying for "O" (for "other") content to comply with the requirement to broadcast non-entertainment genres that included news, public affairs, agriculture, religion, etc.
The music was the hook. The message came between the songs. And the overall content was spiritual and religious.