Of course it’s possible , but far less likely.
Some conversion types are just typically more “one way” than others
I am very surprised that you say that. Just among people I know, I can think of more than 30 who have gone from being religious to non-religious. That is without even having to think very hard. People I know who have renounced religion include a former Catholic priest, a former Anglican deacon, a former Baptist minister, four former Catholic seminarians, several theology graduates, including one who was actively pursuing ordination, as well as numerous former Catholics, Anglicans, Methodists, and Salvationists, several of whom were active as altar servers, in the choir, children’s/youth ministry, etc. I also know several Jewish atheists and one Muslim who is openly gay, so probably not exactly religious.
In my experience, I cannot think of anything like the same number of people who have converted from unbelief to belief. And the numbers bear this out: religious people are giving up religion more than non-religious people are embracing religion.
But then they keep delving even further and at some point become believers again…
I honestly have not seen many people where the last part happens. If any. Among people I know, it’s pretty much that they started out religious and then gave up religion due to learning more about science, psychology, philosophy, history, anthropology, and even religion itself, or because of some personal tragedy (a bereavement or being sexually abused with the Church being the most common), and who then never came back.