I don't get it. Either Satan is a master of deception or he isn't.. right? If he is, couldn't he easily appear as a burning bush? If not, why all the worry about him deceiving us?
He could convince someone that there was a burning bush, but he couldn't actually set the thing on fire. Satan is just a manifestation of everything that can make us go astray; whether you see him as someone doling out laziness or stupidity or as a metaphorical concept is up to you.