That exactly sums it up. To me the telling thing about Trump was not that incorrectly referenced Second Corinthians, it was that he blamed on someone else when it was brought up. A simple "I made a mistake" would have been what I would expect from someone who might make a great president some day.
Trump does the same thing Obama does - always blame someone else if he gets caught in error. It’s very unbecoming. We’ve had 7 years of that crap with Obama. We don’t need 4 more of it with Trump. He’s as big a narcissist as Obama.