If it is true, No one is accountable for anything. If no one is accountable, There are no morals. Without morals, There is no concept of right or wrong. Without this concept, We would all follow our desires. Which according to determinism, Are not our own choices. If they are not our own choices, Someone or something else made them. But if someone or something Determines our choices, Who or what determines The choices the determiner makes?
Either they make their own choices, Which refutes determinism Or the universe, space and time Are infinite and cyclical. Which they are not, Since the universe had a beginning, (Big bang/ creation) And the universe will have an end. (Heat death/ judgement day)
Whether you are religious or not, Determinism is a fools errand.