Question

When Adar enters, strength and splendor increase, and abundant peace dwells for every generation, to the dear Rabbi Dr. M. A.! My soul is in my question: according to the possibility that if there is no God, there cannot be binding morality, then if someone behaved morally three times, is there room to say that this has become like a vow upon him, requiring annulment, so that he not stumble into the sin of vows during the days of Purim, which shine and give warning. With blessings, joy and honor.