When we look in the Bible at the infallible Words of God, Who does not tell lies, we can find that the God of Christ Who should be also our God, is One Singular Spirit Being Who is greater than Jesus and any other human being, also having lots of attributes which surpass those of man.
In mankind's history there can be found natural theology which is generally characterized as the attempt to establish religious truths by rational argument and without reliance upon alleged revelations. Newt to it we may find lots of name-Christians trying to proof God exist but for them Jesus being God, others can see that their idea of God being Eternal, Immaterial, Transcending space, The Creator and Designer of the universe, Omnipotent, Omniscient, The unique greatest possible Being, does not fit at all their Jesus-god. Many people putting 2 and 2 together decide then wrongly because those qualities not fitting Jesus, he is not being able to be God but then there than also not being a Supreme God.
We look at a visible or invisible God, Who is the Being Itself Which created heaven and earth and gave life into beings which got to be.