“For since the creation of the world God's invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through what has been made, so that they are without excuse.” (NASB)
Simple proof that God exists ...
Find a window and look outside.
His Creation speaks for Him.
"1 The heavens declare the glory of God;the skies proclaim the work of his hands.
2 Day after day they pour forth speech; night after night they reveal knowledge.
3 They have no speech, they use no words; no sound is heard from them.
4 Yet their voice goes out into all the earth,
their words to the ends of the world."
Psalm 19: 1-4