Where did they come from? Do they have the power of choice as we do, or are they something like "Androids" and "Robots"? At first, this question may seem irrelevant to the study of the scriptures, yet if we do not know the answer to this question we can easily be led to believe that because God created angels then He is responsible for sin. So let's dig for the Bible's answer. Here are a few texts that should give us some answers.
Ezekiel
28:12 ...Thus saith the Lord God; Thou sealest up the sum, full of
wisdom, and perfect in beauty.
28:13 Thou hast been in Eden the garden of God; every precious stone [was]
thy covering, the sardius, topaz, and the diamond, the beryl, the onyx, and the
jasper, the sapphire, the emerald, and the carbuncle, and gold: the workmanship
of thy tabrets and of thy pipes was prepared in thee in
the day that thou wast created.
28:14 Thou [art] the anointed cherub that covereth; and I have set thee [so]:
thou wast upon the holy mountain of God; thou hast walked up and down in the
midst of the stones of fire.
28:15 Thou [wast] perfect in thy ways from the day that
thou wast created, till iniquity was found in thee.
28:16 By the multitude of thy merchandise they have filled the midst of
thee with violence, and thou hast sinned: therefore I will cast thee as profane
out of the mountain of God: and I will destroy thee, O covering cherub, from the
midst of the stones of fire.
28:17 Thine heart was lifted up because of thy beauty, thou hast corrupted
thy wisdom by reason of thy brightness: I will cast thee to the ground, I will
lay thee before kings, that they may behold thee.
28:18 Thou hast defiled thy sanctuaries by the multitude of thine iniquities,
by the iniquity of thy traffic;
Isaiah
14:12 How art thou fallen from heaven, O Lucifer, son of the morning!
[how] art thou cut down to the ground, which didst weaken the nations!
14:13 For thou hast said in thine heart, I will ascend into heaven, I will
exalt my throne above the stars of God: I will sit also upon the mount of the
congregation, in the sides of the north:
14:14 I will ascend above the heights of the clouds; I will be like the most
High.
John
8:44 Ye are of [your] father the devil, and the lusts of your father ye will do. 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.
Jude
1:6 And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day.
We can learn a great deal, from the above texts, about Satan and about angels in general: