What do you mean by being?
As I quoted recently Rene Guenon sums up the idea of being in its completeness quite well:
If we [...] define Being in the universal sense as the principle of manifestation, and at the same time as comprising in itself the totality of possibilities of all manifestation, we must say that Being is not infinite because it does not coincide with total Possibility; and all the more so because Being, as the principle of manifestation, although it does indeed comprise all the possibilities of manifestation, does so only insofar as they are actually manifested. Outside of Being, therefore, are all the rest, that is all the possibilities of non-manifestation, as well as the possibilities of manifestation themselves insofar as they are in the unmanifested state; and included among these is Being itself, which cannot belong to manifestation since it is the principle thereof, and in consequence is itself unmanifested. For want of any other term, we are obliged to designate all that is thus outside and beyond Being as "Non-Being", but for us this negative term is in no way synonym for `nothingness`
So God in his personal, manifested sense is simply all this being and is obviously beyond birth and death because these things are part of being, but he is not everything in this sense; God in his totality is beyond being, he contains being but is himself non-being; reality, all-possibilty; the absolute, unmanifested totality.