As long as I can sing halfway decent, I'd rather sing than act. There's nothing like being in good voice, feeling good, having good numbers to do and having a fine orchestra.
I don't remember deciding to become a writer. You decide to become a dentist or a postman. For me, writing is like being gay. You finally admit that this is who you are, you come out and hope that no one runs away.
I don't practise any religion but I am deeply interested in the answers that mankind has come up with to explain the human situation.