This quote by Sting suggests that he has just given shallow attention to a spiritual life. He suggests that he has actually not made the effort to genuinely check out and understand the spiritual aspects of life. He might have gone through the motions of a spiritual life, such as attending spiritual services or participating in spiritual practices, but he has not taken the time to really understand and appreciate the spiritual elements of life. He may have done this out of a sense of obligation or to please others, but he has actually not taken the time to genuinely check out and comprehend the spiritual elements of life. This quote suggests that Sting has actually not made the effort to really buy a spiritual life, which he has just paid lip service to it.
"Life is life - whether in a cat, or dog or man. There is no difference there between a cat or a man. The idea of difference is a human conception for man's own advantage"