Romans 1:21
because, knowing God, they did not glorify Him as God, neither were they thankful; but they became vain in their reasonings, and their foolish heart was darkened.
Romans 1:28-30
And as they did not approve to have God in their knowledge, God gave them up to a reprobate mind, to do those things which are inappropriate;
2 Corinthians 6:15
What concord of Christ unto Belial? or what part has a faithful man with an infidel?
John 8:55
indeed you do not know Him: but I know Him. If I may say, I know Him not, I will be a liar like you: but I know Him, and I keep His word.
John 16:3
And they will do these things, because they did not know the Father, nor me.
John 17:3
But this is eternal life, that they know thee the only true God, and Jesus Christ whom thou didst send.