So what is new? Nothing.
Many have claimed Jesus did not exist.
The Jews recognize Jesus as existing. They do not accept He is the Messiah.
The Muslims recognize Jesus as existing. They say He was a prophet but only a man.
Will a court decision change anything. No. Those with faith will continue to believe. Those that do not have faith will continue in their way.
The falling away from faith and the eventual persecution of all those that believe in Jesus as Savior and Lord is prophesied and will happen.