There bes Christians everywhere, mind you, not just SDAs, who believe that demons control anyone who does not think like them. Just look at the whole fundy flap about the "gay agenda" for example. Just because people who bes gay want to be treated equal with heterosexual people in our society, the fundies think they have some secret agenda to "spread gayness" to others and/or to make being gay "acceptable" with some nefarious design in mind in terms of corrupting others' souls, consciences or discernment or whatever.
It's all bullocks. They just don't want to be harassed and persecuted, bes all, and they don't think their orientation bes reason to believe they should be. but that does not stop the paranoid conspiratists from making up all kinds of foul imaginary crap.
A lot of confused supposed "Christians" have similar ideas about occultists and atheists, too. Moriah sometimes wonders (tongue in cheek but with a point) if this genre of "Christian" itself bes not actually
a satanic infiltration designed to discredit the true people of Christ and distract from the true message of Christ. 
Cuz HEY, those who smelt it dealt it!! Right??