In
monotheism and
henotheism,
God is conceived of as the
Supreme Being and principal object of
faith. The
concept of God as described by
theologians commonly includes the attributes of
omniscience (infinite knowledge),
omnipotence (unlimited power),
omnipresence (present everywhere),
omnibenevolence (perfect goodness),
divine simplicity, and eternal and necessary existence. In
theism, God is the
creator and
sustainer of the universe, while in
deism, God is the creator, but not the sustainer, of the universe.
Monotheism is the belief in the existence of one God or in the oneness of God. In
pantheism, God is the universe itself. In
atheism, God does not exist, while God is deemed unknown or unknowable within the context of
agnosticism. God has also been conceived as being
incorporeal (immaterial), a
personal being, the source of all
moral obligation, and the "greatest conceivable existent". Many notable
medieval philosophers and
modern philosophers have developed arguments for and against the
existence of God.