Hillsong's rock music--wild reactions,guys?

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i really believe that rock is just a genre of music and the lyrics of course means a lot.. but some say that when it comes to worship, we don't "offer 'strange fires'" as Nadab and Adihu did in the Old Testament, then they were instantly killed.. but Hillsong seems to be becoming more known.. then comes the comment.. 'the world receives what is of the world'.. i know.. this is kind of offending to some.. but.. what would you say?