Vlad, am I right in thinking Antony Flew was an atheist to which the discovery of DNA gave him an awakening to the realisation that there was something really worth questioning?
Not quite.
Antony Flew was the atheist who thought that the lack (as he then thought) of a plausible naturalistic account of the origin of life led to a deist, Aristotelian god*, but who later admitted that he hadn't kept up with the relevant science (e.g. organic chemistry) and had allowed himself to be misled by those with a religious axe to grind, confessing that he had "made a fool" of himself in the affair. (Flew's own phrase, not mine, hence the quotation marks).
I hope this answers your question, albeit one put to Vlad; from recent experience Vlad's grasp of Flew's muddled latter years isn't exactly all that.
* If anyone should be left in any doubt that a very elderly man's once tack-sharp faculties were not as they used to be, the evidence lies in the fact that he felt this was a good enough argument to accept deism and not the rancid barrel of donkey jizz that it actually is, to wit, the god-of-the-gaps fallacy.