60.

Is there a clear-cut distinction between Angles (Melek) being the servants of God and Demons (Jinn) being the servants of Satan?

Bible: Yes Qur'an: No

Matthew 25:41 – Then he shall say also unto them on the left hand, Depart from me ye cursed, into everlasting fire, prepared for the devil and his angels.

Revelation 12:9 – 9. And the great dragon was cast out, that old serpent, called the Devil and Satan, who deceiveth the whole world; he was cast into the earth, and his angels were cast out with him.

Al-Jinn 72:1—16 – 1. Say (O Muhammad): “It has been revealed to me that a company of the jinn gave ear, and said: ‘We have heard a wonderful Qur’an, 2. Which guides to righteousness, so we believe in it and we shall not join (in worship) any (gods) with our Lord... 11. And among us are righteous folk and among us there are far from that. We are sects having different rules...