ancestry.com is mormon (https://en.wikipedia.org/wiki/Ancestry.com#1983)
wouldn't be surprised if many other such resources also are. for the exact reasons as you explain. these people love "converting" the dead to their religion. they offer much less resistance than the living.
Heres the basics
http://blog.archive.org/2012/04/26/downloading-in-bulk-using-wget
https://github.com/jjjake/internetarchive