His book “Folk on the Fringe” was purely Mormon propaganda, but Ender’s Game is more like Heinlien’s work - the morality is interlaced with a compelling story.
If you get a chance to read Stone Tables, by Card, it’s worth it. While not Mormon in it’s approach, it is very good. it’s essentially the Moses story, and explores how God could take ordinary men like Moses and Aaron, with all their weaknesses and imperfections, and transform them into servants of God. Great stuff.