Romans 1:19
for what is to be known of God is manifest among them, for God hath manifested it to them.
Romans 1:20
Inasmuch as from the first creation of the world, the invisible things of Him, even his eternal power and Godhead, are, if attended to, clearly seen in his works:
John 1:9
The true light was that which enlightneth every man that cometh into the world.
Acts 14:16-17
and all things therein, who in generations past suffered all the nations to walk in their own ways: though He left not Himself without witness;
Acts 17:23-30
for as I was passing along, and looking at what ye worshipped, I found an altar on which there was inscribed, "To the unknown God." Whom therefore ye worship unknown, Him do I declare unto you.