After Antony Flew wrote There Is a God he was criticized by some who thought Flew didn't actually write the book, but his co-author Roy Varghese did. Here's Flew rebuttal of this accusation.
"I have rebutted these criticisms in the following statement: “My name is on the book and it represents exactly my opinions. I would not have a book issued in my name that I do not 100 per cent agree with. I needed someone to do the actual writing because I’m 84 and that was Roy Varghese’s role. The idea that someone manipulated me because I’m old is exactly wrong. I may be old but it is hard to manipulate me. That is my book and it represents my thinking.”"