Since King David is also a major Prophet in Islamic traditions who is actually questioning it.
Outside the bible, there hasn’t been much evidence of a King David as other writings from Egypt/Syria from that time period have not mentioned King David.So many skeptics thought it was fable to the point where they thought bible was wwritten 800 years past this period. Finally in 1993, there was an archeology find and writing on wall, “House of David”. Now with this current find, it beginning to look like there was a King David and skpetics are werong.
Rabid secularists who want to make out that the entirety of Jewish and Christian Scripture is mythology.