God cannot be proven.
The proof is in what God chooses to reveal. Indeed God has revealed himself to mankind,
For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse: (Romans 1:20 KJV)
but mankind refuses to look at the evidence.
Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened. (Romans 1:21 KJV)