Christian rock bands wanted to connect to the youth and get Christianity spread through a new medium and touch more people that prior to this wouldn't have been exposed to. A lot of people pushed back because of the "rock n roll" component of it "but listeners and musicians alike view music as a meaningless delivery system for meaningful words. (“It is the words that make a song sacred,” declared the megachurch pastor Rick Warren. “There are no spiritual tunes.”)" according to the new yorker's article on this topic.