Holy Christ, there were men coming out of the wood.

It is a minced oath or euphemism for "Holy Christ!"

"Holy Christ," I say, having run out of ways of expressing surprise.

Holy Christ, why didn't you say something?

"Holy Christ," Jamie said, loudly enough to be heard across the clearing.

Holy Christ, the place was on fire.

Holy Christ, he thought, how could he have forgotten about the Talbots?

Holy Christ, it was cold out there!

"Holy Christ," he said under his breath.

"Holy Christ, I'm in heaven before I lay down to die!"