Here is how TBS describes the show:
Radcliffe will play Craig, a low-level angel responsible for handling all of humanity's prayers, and Buscemi will play Craig's boss, God, who has pretty much checked out to focus on his favorite hobbies. To prevent Earth's destruction, Craig must achieve his most impossible miracle to date.
This is the first time both actors will be starring in a comedic TV series. Both are better known for their film work. Buscemi led HBO's "Boardwalk Empire" from 2010 to 2014.