Don't like the Big Bang theory or evolution theory, huh?
You're gonna shit in your pants when you see some of the other theories that are going around, then:
Atomic Theory
The Theory of Conservation of Matter and Energy
The Cell Theory
The Germ Theory
The Theory of Plate Tectonics
Game Theory
The Heliocentric Theory
Chaos Theory
Theory of Convection
Quantum Theory
The General and Special Theories of Relativity
The Photon Theory of Light
The Theory of Electromagnetism
Nuclear Theory
The Theory of Molecular Bonds
The Theory of Flight
The Theory of Thermodynamics
The Theory of Homeostasis
The Constructivist Theory of Learning
Inverse Theory
Theory of Gravity
The Prion Theory of Disease
Data Assimilation Theory
Theory of the Ventilated Thermocline
Stommel and Aron's Theory of the Abyssal Circulation
-- and this is just a sample.
Oh, and by the way. A theory with no evidence to support it is not a theory, it's wishful thinking. Like, y'know, gods and shit like that.