I am writing this in summary from the teaching of Brother Daniel Razon. The Bible reveals God as infinite, All. Therefore He is supreme over all. He is the one and only Being in the sense that He is the sole creator or source of all that really exists. In reality, nothing has entity or being separate from God. Paul said (Acts 17:28), "In him we live, and move, and have our being."
To believe in God is to believe that there's someone who created the earth and every living being. (Isaiah 55 vs 9) "For as the heavens are higher than the earth, so are my ways higher than your ways, and my thoughts than your thoughts"
The Bible is the source of our information about God. The Bible is a sufficient proof enough for us to believe in God. Because all the prophecies in the Bible are coming to pass. Isaiah 42 vs 9 "Behold, the former things are come to pass, and new things do I declare: before they spring forth I tell you of them" (John 13 vs 19) "Now I tell you before it come, that, when it is come to pass, ye may believe that I am he"
All God's prophecies are coning true. Like kingdom against Kingdom, famine, fake prophets etc. There's no other book earth that tells us what will happen before they do apart from the Bible. Believe in God's prophecies, believing in God doesn't involve hard labour, rather it improves our life and add to it. (Ecclesiastes 8 vs 7) For he knoweth not that which shall be: for who can tell him when it shall be?
Though we don't see or hear God physical but God exists and he speaks to those that believes in him through his word.
This absolute truth of God's supremacy is made practical in our human experience when we understand the true nature of man, inseparable from God.
Clearly, then, it is not enough for us merely to know God. We must demonstrate the fact that we are actually His expression by living the divine qualities.