The following passages seem to support divine hiddenness:
Truly, you are a God who hides himself, O God of Israel, the Savior. (Isaiah 45:15 ESV)
How long, O Lord? Will you forget me forever? How long will you hide your face from me? 2 How long must I take counsel in my soul and have sorrow in my heart all the day? How long shall my enemy be exalted over me? (Psalm 13:1-2 ESV)
Behold, the Lord's hand is not shortened, that it cannot save, or his ear dull, that it cannot hear; 2 but your iniquities have made a separation between you and your God, and your sins have hidden his face from you so that he does not hear. (Isaiah 59:1-2 ESV)
With their flocks and herds they shall go to seek the Lord, but they will not find him; he has withdrawn from them. (Hosea 5:6 ESV)
Yet Romans 1:18-24 argues that God's existence is evident:
18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth. 19 For what can be known about God is plain to them, because God has shown it to them. 20 For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse. 21 For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened. 22 Claiming to be wise, they became fools, 23 and exchanged the glory of the immortal God for images resembling mortal man and birds and animals and creeping things.
24 Therefore God gave them up in the lusts of their hearts to impurity, to the dishonoring of their bodies among themselves, 25 because they exchanged the truth about God for a lie and worshiped and served the creature rather than the Creator, who is blessed forever! Amen.
(Romans 1:18-24 ESV)
Question: Is God hidden or not?
Note: For those interested in the philosophical aspect of this question, see From a Christian perspective, what are "nonresistant nonbelievers" most likely doing wrong that prevents them from finding and believing in God?