When examined separately, almost all (if not all) of the philosophical and theological aspects of the 12-Steps are unoriginal. As you can see, these ideas have been around for centuries if not thousands of years. Bill W's combining of these various beliefs into a systematic program was what gave the Steps their originality, and even that aspect of the program was derived from the Oxford Group Movement which in turn was derived from Christianity which is two thousand years old.
IMO, the foremost original aspect of the Steps is the idea of defining one's own God. IMO without that allowance, it's doubtful AA would achieved the success it has.