Was Einstein a fake?

. . .Why did the Nobel commitee not award Einstein the Nobel Prize for his work on relativity theory? Could it have been that all who were familiar with the facts, knew that Einstein did not originate the major concepts behind relativity theory?

Relativity was included:

Quoth the Nobel Prize committee: "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect".

The photoelectric effect was most emphasized because the implications of the photoelectric effect (i.e. the invention of the photon) had more immediate and experimentally testable implications for quantum mechanics, which was the most important part of physics at the time and was developing very rapidly.

Of course now, special and general relativity have been tested and vindicated to extreme precision but the technology involved which really require it (particle accelerators & spacecraft systems) were not prevalent in 1921.