Sin is a failure to conform to God's standard as revealed in His character or commandments in thought word or deed. In Satan sin originated in his determination (Isa. 14:12-14) to be above God. In Even and Adam sin originated in direct disobedience to God's command regarding the tree.
Satan before his fall and Adam and Eve before their fall had the capacity to pursue good or evil. Theirs was an untested and defectable (i.e. it could be lost) righteousness. Their wills were free. This capacity was given by God.
In giving this capacity, then, is God responsible for sin? No, He is not the blameworthy cause. When we are glorified in eternity we have an indefectable righteousness and are free only to pursue righteousness.
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