When a man experiences physical death, he loses all of his ability. I was reading just recently about the death of Vincent Foster. The temperature was pretty high and flies were prevalent. Though his blood was still warm, the agent said the flies were crawling all over his face. He had lost all ability to do anything physical because he was dead physically.
Men are by nature spiritually dead.
They may express certain spiritual desires and make declarations that make it appear they are saved, as did Judas. But, unless God regenerates them, they are still spiritually dead, regardless of how spiritually alive them may seem to be. They have not the ability nor will to come to Christ. They have not the ability nor will to believe on the Lord Jesus Christ. They have not the ability nor will to repent toward God.