Its more specifically jews, those who do not know Christ cannot be against Him, but the jews have know Christianity since 600 AD and still fought tooth and nail to deny His Kingship. Even the Mohammedans acknowledge He was the Hebrew Messiah even if they reject His Godhood, but the so-called jews reject both.
That's false and a false definition. "Anti" means to be against something, which is above mere neutrality.
**Period!**