First off, I'd ask what you think "being" is? I see consistently, people show up here and go on God and how God doesn't exist, no evidence for such, but is this difficulty with understanding what being is a contributing factor to understanding what God is? And as Heidegger suggests we are so preoccupied with what "exists" and forgotten the question of the "ground of being", and as I bolded above the investigations have been focused on entities but a more authentic search would be for what underlies all entities and allows them to show up in the first place...........doesn't that sound more like what a God would be? Yet we make and insist to look for God as an entity, a being, but not the source of being or the ground of being. Is that the mistake we make in any kind of attempt at a discussion about God?
From a Buddhist point of view the only thing which exists is the Prime Substance.
It is made out of being and non-being combined together into a state called non-duality. When the non-dual state collapses you end up with the reality we see which is the being and everything else which has been excluded which is non-being.
If you know about Quantum Mechanics the being is our reality, the non-being is the excluded multiverse and if you bring them back together you get a wavefunction which is the same as the Prime Substance.