From an e-mail over at The New Continuing Anglican Churchman blog:
… So, after ten years of full time parish ministry, I have learned that clergy should not bother responding to e-mails like this. Because no matter the response, people with this attitude are not going to change their ways, and have a spiritual revival, and start coming to church, and supporting the ministry, etc. I’ve heard of innumerable troubles that clergy invite on themselves by answering people like this… spiritually dead people with hardened hearts. It is best for clergy to focus their energy on the people in their church who are responding positively and build the church from there. When repeated efforts to teach people fail – because they are not around, and don’t read anything you send – the only thing that you can do is pray for them, as taking them seriously any other way could put them in spiritual danger.
You can read the whole mail here. Sound advice.