Why does luck is connected to supernaturalism/theism?
We use or refer to "luck" whenever we are not available to explain something which randomly happens or it happened "against all odds"
I have checked the definition of luck and it says: the "force" that causes things, especially good things, to happen to you by chance and not as a result of your own efforts or abilities.

Accepting the definition and cause of luck would let us to interpret that theism is just a number of theories that are sustainable in random chances. Then, according to this theory, was the creation of the world a random act instead of a God's effort?