Lewis and the Screw Tape Letters

i was an unbeliever until i read the brothers karamazo. The screw tape letters gave me a real picture of spiritual warfare in a way that i wouldn't have understood prior to that. It's marvellous. And that exactly leads to to the next thing i wanted to ask about f p's done a number of truly excellent lewis projects. Why is there such a close connection between c s lewis and the end fellowship for performing artsy well, it all started with the skew tape letters. I think that book had a very deep impact that led to my conversion.