I think that Jwism - and more particularly the hatred that is shown when someone dares to leave - was the propellant that let me look at philosophy, science, and open free-thought from clean perspective. It cannot be doubted that the influence of Jwism was powerfully part of the formula - both good and bad one supposes, if such can be truly categorized.
This is true - for either better or worse, I believe that radical JWism has caused many who left them to totally question the issues and move on to the agnostic or non-religious position rather than just move on to some other christian church.
EDIT - IF you can call the JW religion truly christian. I now doubt that it is, other than reluctantly by name only.