This is probably the letter you should have gotten:
Dear Keith,
Thank you for thinking of me and sending me your book. Although I don't necessarily agree with what you have written, I respect your position and your right to hold your own views. As old friends I think that our policy with each other is that we 'can agree to disagree.' I treasure our friendship highly and will not let a disagreement in ideologies come between us or negate our long standing friendship. If it is alright with you, I would appreciate that moving forward you not bring up these issues any more in our conversations and I will try not to 'reconvert' you to the Jehovah's Witness way of life. So please call me on the phone, my friend and we can make arrangements to get together and 'rehash' the old days. I would love to see you and catch up on your life!
Your friend,
Steve
Essentially,this is the letter you got:
Dear Keith,
FU@K YOU! Don't contact me ever again!
Steve