True!The both talk about the overall moral of the story.
For an example
THEME Central
Jealousy. Mya always wanted the same
thing Layla had.
Hard work pays
Off. Tyianna worked for hours to
earn money.
Bravery||||Even though Tim was afriad Of heights he still climbed up the mountain.
So basically a theme is telling you something all in one word and a central idea is giving you details.
Hopes this helps.
I would say that a person who is dogmatic does use the defensive behaviour of certainty and that such a person is answering only from the dogma that he/she knows and not being spontaneous and dealing with the topic in a living way in a way that is open to the world and seeing the other person's point of view that though one may not agree with another point of view one should at least respect it.