Or was he?
I remember the book which first changed my outlook on the world and religion: it was Bertrand Russell's Why I am not a Christian, which I read at 14. I never read it since, but I still have it, and remember the key sentence: Why must the Universe have been created?
This is when I stopped believing in God.
You may say that I was ready to go that path, and I'm sure I was, having progressed in a few years from believing in the catholic god to believing only in a creator god.
Also, Russell's book was not art, but philosophy. So to get back to art: I think that in principle it should be the parents' and educators' responsibility to guide children through what they should or not be exposed to as they grow, but the fact that children need guidance should not limit artists in their creation.
However, the truth is, it is becoming always more difficult for parents and educators to exercise that guidance when the media divulge contents freely, any place, any time. But surely we don't want to censor the media.