Psssst...your names are showing.
Interesting exchange of e-mails.
However, that initial e-mail, talking about taking Satan's side, will just shut down an active cult member. They won't listen to anything you have to say once you say something like that.
If your objective is just to rile the elder up, then mission accomplished.
If your objective is to get him to listen to you, then I don't think your approach will work very well.