The statement of being "the chosen one." They used the description in Harry Potter, too. Perhaps Donald J. Trump believes he is Harry Potter. But, regardless, he was completely inappropriate. "I believe someone had to take on China and I decided I would." That is a policy statement and not a joke or inappropriate reference to religion.
The last, but, not least of the issues with Trump's inappropriate and questionably sane state of mind, in relation to the drop in the financial markets. He tweeted irresponsibly and the financial markets panicked and there was a significant drop.
These are and are not significant issues depending on the way a person looks at it. To me, if a person wants to be an enabler to the demise of the USA then overlook it, if a person is worried about the country it is time to get serious.