Why do people worship their favorite imaginary deity out of fear?

The Bible has lots of stories where people were forced to worship the God character out of fear. They were frightened that he would kill them if they didn't comply with his demands to be worshiped. He did kill hordes of people who rejected his demands and he is always threatening to kill all of humanity unless people cater to his every whim.

Are you fearful of incurring his wrath?