It is impossible for the atheist to know there is no God, yet they cling stubbornly, and against all reason, to the belief. Yet they claim they are the rational ones; they are the intelligent ones. This is why I have respect for Flew who has admitted his error. I have even greater respect for guys like BibChr who not only found his way out of atheism, but continued till he discovered the identity of the One True God.
I'd like to see Ichneumon find his way out as well. He's not stupid but he is stubborn.
Flew, BibChr, C.S. Lewis discarded atheism.
BibChr, C.S. Lewis continued to Christian theism.
Flew & C.S. Lewis had continuous exposure to theists who were Christian and had the patience to tolerate their stubbornness.
Persistance seems to be the key.