His mum's departure also left Jackman with fear issues.
"From the moment Mum left, I was a fearful kid who felt powerless ... I was the youngest. I used to be the first one home and I was frightened to go inside. I couldn't go into the house on my own. I'd wait outside, scared, frustrated. Growing up I was scared of the dark. I was scared of heights. It limited me.
"I hated it, and that contributed to my anger. Isn't most anger fear-based, ultimately? It emanates from some kind of powerlessness. I was really feeling that."
Bordering on becoming a deeply troubled teen, the Les Miserables star turned to God for help. "I used to go to different evangelists' revival tents all the time," Jackman said. "When I was about 13, I had a weird premonition that I was going to be onstage, like the preachers I saw."
It's faith that still drives him.
"Before I go onstage every night, I pause and dedicate the performance to God, in the sense of, 'allow me to surrender'. When you allow yourself to surrender to the story, to the character, to the night, to the audience, transcendence happens. And when that happens, there is nothing like it on the planet.
"It's the moment people experience when they fall in love, which is equally frightening and exciting. That's what it feels like."