  It was shown that quantum metric fluctuations smear out the singularities of
Green's functions on the light cone [1], but it does not remove other
ultraviolet divergences of quantum field theory. We have proved that the
quantum field theory in Krein space, {\it i.e.} indefinite metric quantization,
removes all divergences of quantum field theory with exception of the light
cone singularity [2,3]. In this paper, it is discussed that the combination of
quantum field theory in Krein space together with consideration of quantum
metric fluctuations, results in quantum field theory without any divergences.
