"In the beginning God created the heaven and the earth." - Genesis 1:1 KJV
The Bible begins by asserting that God exists. It does not dispute the fact; it simply states that God is Creator of the heaven and earth.
For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it. - Exodus 20:11 KJV
... The heavens declare the glory of God; and the firmament sheweth his handywork. Day unto day uttereth speech, and night unto night sheweth knowledge. There is no speech nor language, where their voice is not heard. Their line is gone out through all the earth, and their words to the end of the world. In them hath he set a tabernacle for the sun, Which is as a bridegroom coming out of his chamber, and rejoiceth as a strong man to run a race. His going forth is from the end of the heaven, and his circuit unto the ends of it: and there is nothing hid from the heat thereof. - Psalm 19:1-6 KJV
By the word of the LORD were the heavens made; and all the host of them by the breath of his mouth. - Psalm 33:6 KJV
For he spake, and it was done; he commanded, and it stood fast. - Psalm 33:9 KJV
Through faith we understand that the worlds were framed by the word of God, so that things which are seen were not made of things which do appear. - Hebrews 11:3 KJV
In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. 3 All things were made by him; and without him was not any thing made that was made. - John 1:1-3 KJV
For by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by him, and for him: And he is before all things, and by him all things consist. - Colossians 1:16-17 KJV
It does not attempt to rationally prove God´s existence; no one can do so.
But neither can it be proven that He does not exist.
If God wanted to, He could appear and show Himself. But He does not.
Since the Fall, God could no longer speak face to face with humanity and condescended to reveal Himself through His prophets, who recorded their messages in the Scripture.
However, God has not left us in the dark.
He has given us abundant evidence to believe His existence.
Based on I Will Go by Alejandro Bullón