Romans 1:21
Because though they knew God, they did not glorify him as God, nor were they thankful to him; but became perverse in their reasonings, and their senseless minds were darkened;
Romans 1:28-30
And as they did not choose to retain God in their knowledge, God gave them up to a reprobate mind, to do things which are shameful;
2 Corinthians 6:15
And what concord hath Christ with Beliar? Or what part hath a believer with an unbeliever?
John 8:55
yet ye know him not; but I know him. And if I should say, I know him not, I should be a liar like you. But I know him, and keep his word.
John 16:3
And these things will they do, because they neither know the Father nor me.
John 17:3
And this is the everlasting life, to know thee, the only true God, and Jesus Christ whom thou didst send.