What Star of David?

David Landau wrote in 1995 an article titled: Ancient Synagogues in the Holy Land - What Synagogues?
In this article he claimed that some of what archeologists call "Ancient Synagogues in the Holy Land" are in fact Roman temples built by Maximinus Daia (305-313 C.E.) in order to fight the rising Christian religion, and not Jewish Synagogues.
Since he wrote his article 11 years ago I sent him an E-mail asking if he still believes in his theory or did he change his mind with the time that passed since he brought it up? His answer was:
Yes, I still believe that those ancient buildings weren't synagogues
If David Landau's theory is right the meaning from my point of view is that the "first" Jewish Star of David, which was found in Capernaum was not Jewish!