"Does the physical resurrection of Christ meet the requirements of your definition of nonsense?"
Stop trying to conflate bronze age superstition with the Gospel. That is exactly the tactic that is so horrific to evangelism.
Before I can honor your request, you'll have to tell me what you believe “the Gospel” is and how you know what it is. You've already stated that it is possible that Christ was mistakenly quoted in the Bible (“Another explanation is that someone else said this and it was attributed to Christ.”) and that the Genesis account of the Flood is “nonsense”. What else in Scripture do you consider to be nonsense? What is your basis for rejecting the Old Testament testimony concerning the physical reality of the Flood, and for rejecting the New Testament testimony concerning the physical reality of the Flood (including your tentative rejection of the words of Christ), but accepting the Old and New Testament testimony concerning the physical reality of the resurrection of Christ?
For I have five brethren; that he may testify unto them, lest they also come into this place of torment.Abraham saith unto him, They have Moses and the prophets; let them hear them.
And he said, Nay, father Abraham: but if one went unto them from the dead, they will repent.
And he said unto him, If they hear not Moses and the prophets, neither will they be persuaded, though one rose from the dead.