Mike Johnson worships himself, like a lot of ignorant people who call themselves Christians right now.. calls himself Moses and so on, because he's full of pride.. and yeah, that is the same as worshipping Satan, or "being controlled by the Devil" or however else you want to say it..
I think when a Christian minister is making a statement about a guy who is VERY vocal about how his every action is influenced by his being a Christian, then a Christian denounciation feels adequate.