Question

who proved that someone is god

Answer 1

god is a supernatural belief of our mind which needs not be proved
it's only a strong desire of our hearts which sometimes stop us from wrong deeds

Answer 2

God is conceived of as the Supreme Being and the principal object of faith.[3] The concept of God, as described by theologians, commonly includes the attributes of omniscience (all-knowing), omnipotence (unlimited power), omnipresence (present everywhere), and as having an eternal and necessary existence. Depending on one’s kind of theism, these attributes are used either in way of analogy, or in a literal sense as distinct properties of the God.

God is most often held to be incorporeal (immaterial).[3][4][5] Incorporeity and corporeity of God are related to conceptions of transcendence (being outside nature) and immanence (being in nature, in the world) of God, with positions of synthesis such as the "immanent transcendence".

Some religions describe God without reference to gender, while others use masculine terminology, using such terms as "Him" or "Father," and some religions (such as Judaism) attribute only a purely grammatical "gender" to God.[6]