A general theorem providing a mathematical basis for a Grand Unified Field Theory or a Theory of Everything (TOE) is presented. The proof of the theorem is shown to be a recent work entitled, “Generalized Mathematical Proof of Einstein’s Theory Using a New Group Theory”, which has been reviewed by the American Mathematical Society (MR 98e 83007). This work provided generic solutions to the unified force field, from which both the Newtonian and Einsteinian gravitational force fields seem to be recoverable. Similarly, the electromagnetic force field, as well as the Strong and Weak force fields, also seem to be recoverable from these solutions. Thus one solution describes these four force fields (Gravitational, Electromagnetic, Strong and Weak), plus other possible unknown force fields, in a unified manner, together with experimental backing. The unified force field solutions have both wave and classical components. The wave component is a unified wave function, which satisfies both the regular wave equation as well as the Schrodinger’s wave equation. This means that quantum phenomena could be explained by these solutions. It also seems that the String theory concepts could be explained by these solutions as well. Furthermore these solutions seem to explain the Electro-Weak unification theory, which along with the Quantum Chromo-Dynamics (QCD), forms the basis for the so-called Standard Model of the universe. The limit of the new unified force field solutions as time approaches the beginning of the universe shows that all force fields including the four known ones, are unified as one wave force field. This seems to suggest that God, (as well as life and the soul) could exist in the form of Waves (called Spirit). In addition, this also seems to suggest that the Big Bang Theory may be a Big Sound Wave theory, which could be what the Holy Books refer to as the Word of God that created the universe. Furthermore, it is suggested that immortality could be feasible if the escape velocity for life waves could be determined and a means for preventing their escape could be found similar to light waves in black holes. Since the investigation does not assume the existence of particles a priori, matter could therefore be interpreted as high force field intensity. The Grand Unified Theorem produces a set of unified field equations from which Yang-Mills equations, other physical equations, and in general, mathematical equations which have ever been known to human beings, can be recovered. The solution seems to mathematically represent the modification of space-time structure predicted by Einstein’s general relativity theory. A good part of the material presented in this work has been reviewed by the American Mathematical Society and the European Mathematical Society in the Zentralblatt für Mathematik.