God!
Oliver doesn't believe in god. If there were one thing he would trust the least, it was god.
The boundless rage from his past life for all the suffering he endured was still fresh inside him. Albeit buried in the depths of his heart, hidden from the world, he would never forget it.
For a person like that, the existence of gods would mean he had some more things he could direct his rage to. So, if there really existed a god or gods, they were just names that he would add to his list of nemeses.
The same was true for Root of the past. Hence, Root praying to god felt a little funny to him.
Certainly, he had no reason to thank god. In fact, it would have been more apt if he had thanked himself. Technically, his action changed the flow of both of their lives.
At the end of the day, no god saved them. It was they who worked hard to save themselves.
"Of course, I would like to thank you too, Oliver." Root quickly corrected.
Oliver smiled, satisfied.
