Those who demand God come and show evidence of Himself should know: He did come and He raised Lazarus from the dead. The Pharisees plotted to kill him.
"But the chief priests plotted to put Lazarus to death also" (John 12:10).
He healed a man born blind, but the Pharisees refused to believe he was healed.
"But the Jews did not believe concerning him, that he had been blind and received his sight, until they called the parents of him who had received his sight. And they asked them, saying, “Is this your son, who you say was born blind? How then does he now see?” His parents answered them and said, “We know that this is our son, and that he was born blind" (John 9:18-20).
Jesus came, died, and rose from the dead and the evidence was suppressed by the authorities. They rejected the evidence.
"When they had assembled with the elders and consulted together, they gave a large sum of money to the soldiers, saying, “Tell them, ‘His disciples came at night and stole Him away while we slept.’" (Matthew 28:12-13).
"But he said to him, ‘If they do not hear Moses and the prophets, neither will they be persuaded though one rise from the dead'" (Luke 16:31).
Secularists demand evidence, but then they usually just reject it. The Bible makes it clear those who reject God reject the obvious evidence that He exists. God came as the man Jesus, and He raised the dead, healed the lame, blind, and deaf and despite the obvious evidence most rejected it--just as most do today.
Secularists claim they want evidence--but most don't--they just reinterpret it based on their religion--they are willingly ignorant. For those who reject creation and the global Flood, God tells us they deliberately refuse to believe regardless of the overwhelming evidence.
"For this they willfully forget: that by the word of God the heavens were of old, and the earth standing out of water and in the water, by which the world that then existed perished, being flooded with water" (2 Peter 3:5-6).