One who believes that all things and events in life are predetermined is a

Solution(By Examveda Team)

One word substitute is Fatalist.

Fatalist: someone who believes that people cannot change the way events will happen and that events, especially bad ones, cannot be avoided.
Puritan: a member of a group of English Protestants of the late 16th and 17th centuries who regarded the Reformation of the Church under Elizabeth I as incomplete and sought to simplify and regulate forms of worship
Egoist: a self-centered or selfish person.
Tyrant: a person exercising power or control in a cruel, unreasonable, or arbitrary way.