Satan himself is transformed into an angel of light

"...Satan himself is transformed into an angel of light."  (II Corinthians 
11:14) 
 
If Satan came to us wearing a red suit, carrying a red pitchfork, had a 
fiendish scowl on his face, had a forked tail, it is very doubtful that we 
would listen to anything he said to us.  Especially we would not listen to 
him if he declared to us that he hated us and was out to make our lives 
miserable and his purpose was to destroy us, our families, our churches and 

all that we hold dear. 
 
But, that's the problem. He has transformed himself into an angel of light. 
Jesus says of the devil, "He was a murderer from the beginning, and abode 
not in the truth because there is no truth in him.  When he speaketh a lie, 
he speaketh of his own: for he is a liar and the father of it." (John 8:44) 

The Bible tells us to resist the devil and he will flee from us.  Trust in 
God and His word with all your heart.