He doesn't know Jesus, and when the time comes, Jesus will not know him.
What do Stalin, Lenin, Mao, Madeline Murray O'Hair all have in common? They ALL now know there is a God.
For those who deny that Christ actually existed all they need to do is search historical records,Josephus wrote about Him,Pilate wrote about Him,and many others who were his contemporaries wrote about Him.
I have no doubt He existed or that He still exists within His followers.
As for someone being a loon,the world is full of them,just look at the atheists.