Every outcome in this world is a mathematical function. Do you agree?
Every outcome is controlled by variables that are sometimes known or sometimes unknown. If we could identify these variables, we can predict any outcome in this world.
Do you agree?
Maybe to the first one, Big definite no to the second one- quantum physics, chaotic systems (as in Chaos theory) and the fact that we still don't know all the rules of nature are theoretical limits to your idea.
No. Determinism hasn't been an accepted model of physics for a hundred years.