Are humans fallen angels who are being given the chance to earn their place in heaven again? I was reading somewhere that this is true. The source gave no scripture references, however. Please give all answers from a biblical standpoint. I do not care of what denomination you are. Just show me in the word. Is there any scripture that backs up the claim that humans wew once angels? Thank You.
The Bible doesn't support this at all, so there is no scripture reference to give. Although perhaps there is a negative one.
Speaking of Jesus' incarnation, the author of the epistle to the Hebrews says:
Hebrews 2:16 For verily he took not on him the nature of angels; but he took on him the seed of Abraham. (KJV)
That is, Jesus came to save men, not angels. This is why he took on human nature, not angelic nature. And it obviously also means that men are not angels. There is also Psalm 8, which is partially quoted in Hebrews 2.
Psalm 8:3-5 When I consider thy heavens, the work of thy fingers, the moon and the stars, which thou hast ordained;  What is man, that thou art mindful of him? and the son of man, that thou visitest him?  For thou hast made him a little lower than the angels, and hast crowned him with glory and honour.
So, men are not angels, but a little lower than the angels.