I think that such conversions and deconversions tell us a lot about the condition of human thought regarding gods in these times, but you have to step back and look at the overall trend. Right now, the trend seems to be that a larger percentage of people are losing faith than are (re)gaining it. The demographic trend is for larger numbers of non-believers among young people. From that perspective, religious faith is diminishing.
Anecdotal individual conversions are useful for what they tell us about the specific thinking behind conversions. How do these people justify their reconversion to Christianity? Is there anything substantive behind their arguments? It seems to me that most of the reconversions seem to cluster around the argument from design, which is still a very potent underpinning for belief in gods. For example, Antony Flew admitted that his conversion (to deism, not theism) grew out of his inability to believe that DNA could have arisen from natural processes. I find such rationalizations to be completely unconvincing, but I understand why others find them compelling. It gives them a basis for raising "doubts about doubts", as Larsen (the author of the WSJ piece) put it.
But I think that the more compelling reason for conversions from non-religion to religion are emotional ones--what I find to be the overarching theme of apologists such as CS Lewis. Lack of belief tends to alienate one from the mainstream of society, if not one's own circle of intimate family and friends. Conversion to the prevailing religion carries a lot of social benefit. The battle between theists and non-theists goes on at more than one level. It is not just an intellectual argument. It is also an argument over how we are to relate to each other and our environment. Belief in God empowers people, and lack of belief comes to be seen as a means of cancelling or draining away that power. That is why the Pope's primary attack against atheism was the argument that it left us with no hope. In the end, people want to believe, because belief makes them feel stronger and better, even if it doesn't make much sense on an intellectual level.