The Logic of Indecision:
If you say you are agnostic, you are saying that you do not know, but the implication is that you believe there is insufficient evidence and that no one else should claim to know either.
If you say that you are undecided you are making a statement only about yourself, a statement that needs no proof.
If you say you are an atheist, you are saying that you do not believe. However, in truth you have decided that there is no God, and the implication is that others would agree if they were as rational as you.
Am I off base here? I’m undecided.