2nd Question:
As you probably can see by now where I stand on the topic. I couldn't justify in myself, how I could play in a smokey bar, "Song Title #1: about Fornication, Sex, or whatever" and setting the mood, for some folks to go home and commit sin, on a Saturday Night. Then wake up early sunday morning, and play "Song Title #2: about living a life pleasing unto God"
No more than I can justify, speaking at a Planned Parenthood, on the topic, of premarital Sex is natural, and healthy if you use protection, on a Saturday evening, and then waking up early sunday morning, and Preach a Sermon about holiness.
With that said, I think some of the secular/worship musicians; would be so much more than "Gifted", if they took the Levitical mindset of what their purpose is as a musician. They would move to a realm where they can play, and demons would tremble, deliverance would surely come, when they played. My 2 Cents.
I also wanted to point out, that "God is not the creator of all things, in a literal sense." To say God created the bassline is to also say, he created the lyrics, and we know that many lyrics oppose the will of God.