Reasonable question.

http://www.talkorigins.org/indexcc/CA/CA115_1.html

Apparently his conversion was not to theism, but to weak deism.

However, I tracked this down and the situation is like this:
His recantation was half-hearted. Flew is not a scientist, btw, but a philosopher.

In private conversations, he admitted he was misled in the only 'evidence' supporting his conversion - unfortunately, he won't give his permission for those letters to be published.

In any event, Flew's opinion on the subject is irrelevant.