I'll gladly agree that FL would not get far on a campaign designed to 'convert' (sorry, can't think of another handy word at the moment) through a spiritual appeal.
I do think a successful approach would need to use church, school, media, etc as Tools though. Presuming FL turns out to have very strong Leadership qualities, I believe it's possible to cover more area by wise use of what's available and established. No reason to reinvent the wheel. Besides, that's where the easiest meeting places are.

What would encourage people to attend a (what would the rallys be called?) gathering thing? Nothing is gained if nobody is interested. I believe there's a fair percentage of people who would be willing to do a little bit toward a positive impact if they could be lured to listen. I think most people like to learn and nearly everybody abhors being talked down to.

So, FL has learned the history from about 1700 up to now..from a variety of sources and perspectives so he can talk confidently.
Is it more effective for him to pull them as Followers..or to plant a seed and send them out hoping for the best? Would it be more productive to try for the unaffiliated, or to aim directly at the ones already following a path of hatred?

I honestly would like to see if a reasonable plan can be worked out by simply talking back and forth. Ideas are easy, Implementation isn't. I imagine a lot of folks have ideas about what should be done but I've never seen a plan for How.