I apologize, it was actually “Antony” Flew. I mistakenly wrote Andrew. From everything I have read he was not senile in the least and he wrote the book entirely himself.Several names on that are disputable and none of them seemed find any evidence. Andrew Flew was old and senile and did not even write much of the book with his name on it if any. There are interviews with him after it was published. Lee Strobel appears to be a fraud since his "investigation" would not be one that an atheist would do. He acted like a Christian looking for evidence and like a Christian accepted the weakest claims as evidence. Francis Collins was not convinced by evidence he had a "spiritual" encounter with a waterfall if I remember correctly.
“The atheist community was not bashful or tardy in attacking professor Flew’s new book. They claimed that Flew was demented or senile and that his co-author, Roy Varghese, did most of the actual writing and inserted his own opinions and claimed them to be Flew’s. Flew shot back with a penetrating public statement making it abundantly clear that the book “one hundred percent” represented his own opinions. Flew’s rejection of atheism and embrace of Deism was unequivocal. He repeatedly affirmed that there had to be an Intelligent Designer to bring life into being.“
Antony Flew: A Leading Atheist Who Came to Believe in God – The Teaching Ministry of Bill Nugent