Muslims - The Angel Gabriel who came to Mohammed. How is it that in the bible the first thing angels do is...?

say "fear not" to calm the person who is recieving a visitation, but the "angel gabriel" who visited Mohammed pressed on him and caused him terror and turmoil, physically, mentally and emotionally. Does this sound like an angel of a loving God to you? Because to me it sounds like a demon or the devil himself sent to pervert the teachings of Jesus through deception