What is dadavian?

Do you mean Davidian?

probably, I’m not sure

If you mean Davidian, this is from wikipedia:

The Davidian Seventh Day Adventists, or Shepherd’s Rod, is a religion broken off of the Seventh Day Adventists. The Shepherd’s Rod is the original doctrine which followers of the Davidian Seventh Day Adventist profess. The group is often referred to as “Shepherd’s Rod”.

The Davidians are part of the Adventist Movement, made up almost entirely of ex-members of the Seventh-day Adventist Church, of whom have been disfellowshipped, or excommunicated. The name, “Shepherd’s Rod,” is derived from the title of a two-volume series authored by Victor Houteff, the originator of this doctrine, in 1929.

http://en.wikipedia.org/wiki/Shepherd%27s_Rod