Hello mord, and good day to you.
From my understanding many of the original JDL members were non-Orthodox. Perhaps Jimmy can add a bit more.
It is the hope and belief of the Jewish people that all good Jews will return home and become Torah observant eventually. I personally pray that all good Jews will eventually find Torah, and help bring about final redemption. We have many good Jews on this forum who are working on that as we speak.
Kindest regards,
Christopher