Does General realtivity thoery treat the four fundamental forces of nature as fictious, and as space warps?

Answer 1

GR does not address the other forces. It is a (very accurate) description of only the "force" of gravity, which it describes not in terms of force carriers but in terms of a non-euclidean geometry of space itself (the 4-D spacetime continuum, actually). It does not address or attempt to describe the other three forces at all.

It does, however, predict the existence of gravitational waves which, under the same paradigm as quantum electrodynamics and the standard model, equates to "gravitons" or gravitational quanta, which are to gravity what photons are to the electromagnetic force. They are extremely difficult to detect, though, for two reasons; because the gravitational force is so weak (dozens or orders of magnitude weaker than the strongest forces), and because gravity waves are truly gargantuan in size (wavelengths are many miles long).

Answer 2

Nope ... they're not fictitious. Only mass and dravity can be asociated with warped space.