You don't know that they are not interested and you don't know that they are non-consenting. THEY'RE DEAD!
Keeping a data base is important so that they don't waste their time twice or three times. If they keep a data base, then they can keep their silly time wasting efforts to a minimum.
Then why the hell don't they just say, "JimmyJoe, I baptise you on behalf of all people, living or dead, who may or may not appreciate the effort you are making today."
And be done with it.