Welcome Tim.
I believe that current technology has not advanced to the point that it can be done safely. I believe sixties technology was wholly incapable.
Then you will have to explain why your belief is more valid than that of people who work in the aerospace industry, and where the qualified professionals who share this belief are.
I believe the Apollo missions to the moon if they occurred at all were unmanned.
Then you will have to provide evidence of how they were accomplished unmanned in such a way as to convincingly fake manned flights to the extent seen in the record.
I believe the truth of the deception can be deduced from the space mission data conducted this century.
ANd you will have to explain why the data gathered in the previous century is insufficient and what 'new discoveries' this century have allowed that conclusion.
But for now you can start by addressing the radiation claims in this thread.