Romans 1:19
For what is to be known of God, is manifest in them; for God hath shewed it to them.
Romans 1:20
For those things of him which are invisible, both his eternal power and Godhead, are clearly seen from the creation of the world, being understood by the things which are made, so that they are without excuse:
John 1:9
This was the true light, who lighteth every man that cometh into the world.
Acts 14:16-17
Yet he left not himself without witness,
Acts 17:23-30
For as I passed along and beheld the objects of your worship, I found an altar, on which was inscribed, TO THE UNKNOWN GOD: him therefore whom ye worship without knowing him, I proclaim unto you.