WoW!! God authored it and then cast him/it out. That is just bad reasoning.
God took resonsibility for sin by sending Jesus to make a way possible for man to escape its curse, its conclusion. Sin was found in the freewill given Lucifer when he declared he would set himself up to be higher in heaven than God. This same freewill is a necessity in man that he must choose whom he will follow. God is always looking for those who "will" it within themselves to choose Him. There is no life without Him. Sin is death. Did God Author that as well?