If Trump felt a promise to part the seas was politically advantageous, it would have been in last night's speech, as if a wave of his hand will lead to such an event.  
Seriously, here is just one example, Trump promises to crack down on crime, and yet, he supports a further loosening of laws in order for gun owners to sell guns to mentally challenged individuals (as reported in the G&M and NYTimes a couple of weeks ago).  His promises don't jive with policy.
Delivering a speech is easy.  Set up each topic with some "alt fact" (Health care is a mess and Obamacare is unaffordable).  Then make a promise (we will repeal Obamacare and provide coverage that is cheaper, accessible, and covers more).  Then go to the next topic.  Throw in some grieving widows, refer to our great soldiers, get the Republicans to stand and clap like trained seals (navy seals?), and Bob's your uncle.
I don't think he has a clue of where to go next, but there was lots of political theatre last night.