Briefly, Trump is trying to appeal to the cultural conservatives, and he's not going for the libertarians, Koch-wing, or neocons. Nor is he trying to figure out actual policy (so he's not trying for the hundred or so policy wonks either).
My interpretation (which is not original but in the general American miasma), is that Trump is aiming for the Archie Bunker vote. He says exactly what Archie Bunker wants to hear.
Now, Archie Bunker isn't known as a deep thinker or insightful critic, so it's not hard to pass a bunch of bunk through Archie Bunker's ears. Talk radio hosts have been doing that for decades. However, it took a 21st century version of PT Barnum to do it as a presidential candidate.