God created angels and Jinn before human beings. Angels are incapable of choosing to be disobedient towards God. Angels were created without desires.
Jinn on the other hand were created with desires and intellect. They can alter their shape, size and appearance so that they can appear like how many people think of Angels.
Jinn often take the appearance of Angels in popular culture in order to convince people to worship them or some other false deity.
The surest way to know whether it is an Angel or an evil Jinn is that an Angel would never bring revelation to anyone except a Prophet. This means, an Angel would never bring anything which contradicts, alters or changes the revelation and laws as revealed to the previous Messenger. Whereas an evil Jinn appearing like an Angel always tries to encourage a person to act contrary to revelation and Divine Law whether through false worship and obedience or through corrupt beliefs and thoughts.
Most "Angels" that appear to Christians, even appearances of "Mary", are always evil Jinn telling the devotee to build a shrine or altar upon which to make offerings of worship and acts of obedience. This is all false worship and acts of disobedience to the Creator. Evil Jinn want people to worship other than the Creator. This is the task that Satan himself has assigned them.
The impression that Christians have that "not all angels are good" is based on a misunderstanding they have about the creation itself.
So, Christians have a concept of "fallen angels" whereas Muslims do not. All Angels are good and only obey the Creator. Whereas Jinn can be good or bad. The good Jinn obey God in avoiding the residences and areas of human beings. Evil Jinn live among human beings, always looking for ways to misguide us, even appearing as "Angels" in order to solicit false worship and disobedience to the Creator.
The Angels and the Jinn - Bilal Philips
https://www.youtube.com/watch?v=Toiqdm5XHMw
إسهام الإسلام في الحضارة الغربية | ش.عثمان بن فاروق في حوار مع نصراني
https://www.youtube.com/watch?v=RlT-PoszLKg