Do you realize how silly you sound implying someone is working for satan because of some vague hand gesture that he is probably not even aware he is doing. I have met the man, have read and viewed his life story (available as book or video), and seen a number of his seminars over the years. You would have to be pretty committed to finding fault with him to take the stance you have. Open your mind to God's Word a little more, and stop focusing on unimportant things such as hand gestures, unless you can prove that he knows he is doing them and admits they have some sort of meaning. Until then, focus on the speck in your own eye.