I am listening to English dialogues for learning purpose. I came across the following phrase in [this](https://www.youtube.com/watch?v=nJQBuQQxVd0&t=10m43s) video. At 10:45, he says, "I am really grateful for God". But most of the time, I have read *grateful to God*, because we are referring to someone. Shouldn't it be *grateful to*? Thank you.

Video link: <https://www.youtube.com/watch?v=nJQBuQQxVd0&t=10m43s>