What is the the difference between Aliens, Fallen Angels and Angels?

Please only answer this question if you are a Christian and if you believe in all three listed above. Thank you! :) I am a Christian and i know what the difference between all three are.....The question i really mean is how to tell the difference when one abducts you. Do they all have spaceships? Do they all abduct people? Are aliens bad just like fallen angels? Do angels (God's angels) sometimes "abduct" people to speak to them for certain reasons? Are aliens and fallen angels working together to prepare for when God ends the world or are they here for complete different reasons? Why do aliens and fallen angels seem to look alike? I have a very open mind, so please tell me anything, no matter how "crazy" it seems. Please even tell me of your abductions and ANY information you have on any of them or all three "beings." THANK YOU! :) (you can even email me privately.) :)