The Unified Theory of the source of all matter in the universe is based on string theory.
All objects, an apple for example, or even us people, are made of atoms. At one time atoms were thought to be the smallest objects, indivisible. Scientists later discovered atoms are made of electrons, protons and neutrons. The protons and neutrons are made of quarks. The quarks and electrons, as well as all other particles like photons (light) are made of strings. This may one day be proven true, no longer just a theory. But the question then shifts from “where did atoms come from?” to “where did strings come from?” In the end we still have the same problem – the source of ‘all’, regardless of what that ‘all’ is. The Bible tells us right at the beginning, that “In the beginning God created …” He is the source of all.